My PC does not appear, I see a blank screen but I hear the fan and the keyboard lights flash and a few beeps. What?

By on April 3, 2010, 8:51 am

My PC does not appear, I see only the white screen but I hear the fan running and the lights flash on the keyboard and a few beeps. What? At startup, computers perform a Power-On Self Test, commonly known as POST. If problems are detected at boot, you can usually diagnose them using the error codes displayed on the screen. However, if nothing appears on the screen, the computer can use sounds (eg, beep codes) to tell you what is wrong. Many of these errors indicate hardware problems to a qualified technician should correct. But to start, if you see the keyboard lights flash while twice that means your computer motherboard works well. Otherwise, you can absolutely diagnose the cause of something wrong with motherboard components. Many BIOSes have different beep codes, even if they appear to come from the same manufacturer. This is because manufacturers of motherboards reprogram the codes to reflect their own customizations. You can often go to the website of the motherboard manufacturer to find the updated code, but you can find cases where the manufacturer simply did not document the changes. Award Award BIOS errors typically use the screen more than beep codes. For Award BIOS Manufactured by Phoenix Technologies, note the following points in the Phoenix Technologies AwardBIOS Error Messages page: “The AwardBIOS beep code indicates only that a video error has occurred and the BIOS can not initialize the screen video to display additional information. This beep code consists of a single long beep followed by two short beeps. Any other beeps are probably RAM (Random Access Memory) problems. “Award BIOS are not manufactured under Phoenix Technologies use the following beeps and this information is centrally from the BIOS Award BIOS Beep Codes page: Beeps Meaning 1 long, 2 short video card error: Bad or improperly installed video adapter Repeating Beeps Memory Error: Bad or improperly installed RAM 1 long, 3 RAM card Bad short video or video is not present at high frequency beeps CPU overheating: Check fans Repeating High / Low beeps CPU seated properly or defective CPU AMI (American Megatrends) The following information from beep BIOS AMI BIOS Beep Codes page Central and what do they mean? 1 short DRAM refresh failure 2 Parity error short-circuit in the first 64K of RAM: Likely a bad RAM IC, or perhaps a test equipment failure has missed 3 of working memory in the first 64K RAM: Likely a bad RAM IC 4 short system timer error: Bad IC clock or RAM in the first bank failure of memory 5 short Processor: The processor has failed. 6 short Keyboard controller Gate A20 error: The keyboard controller has failed. Thanks to its integration into the system board, you will generally replace the motherboard. Error 7 short Virtual mode exception: CPU has generated an exception error, bad CPU or motherboard 8 short Display memory read / write test failure: Bad video card 9 Failure to control short-ROM BIOS: BIOS is defective stop short of 10 CMOS read / write error 11 short Cache Memory error: Specifically, the L2 cache is bad. 1 long, 2 short video system error: error in the BIOS of the video card, or a horizontal retrace not 1 long, 3 short Conventional / Extended memory failure: bad RAM is 1 long, 8 short Display / Retrace test Failed: video card is defective or missing AST BIOS The following information is from the BIOS BIOS Beep Codes Central AST page. Beeps Meaning 1 short failure CPU register test: The CPU has failed. 2 Standard keyboard controller buffer short: The keyboard controller has failed. 3 Regulator keyboard shortcuts not reset: The keyboard controller has failed or the motherboard circuitry is faulty. 4 Short Communication Error Keyboard: Keyboard or keyboard controller failure Bad 5 short entry Keyboard: The keyboard controller IC has failed. System failure 6 short board chipset: chipset motherboard has failed. Replace the motherboard. 9 short ROM BIOS checksum error: The BIOS ROM has failed. If possible, replace the BIOS on the motherboard. 10 short failure timer test system: The system timer IC has failed. 11 short ASIC failure: the motherboard circuit failed. Replace the motherboard. 12 shortstop CMOS RAM register Error: The real time clock / CMOS has failed. Replace the CMOS or motherboard. 1 long DMA controller 0 failure: The DMA controller IC for channel 0 has failed. If possible, replace the IC. 1 long, 1 short DMA controller 1 failure: The DMA controller IC for channel 1 has failed. If possible, replace the IC. 1 long, 2 short Video error vertical refresh: The video card has probably failed. Replace the video card. 1 long, 3 short Video error test of memory: The memory of the video card has failed. Replace the video card. 1 long, 4 short Video adapter error: The video card has failed. Replace the video card. 1 long, 5 short 64KB memory error: An error occurred in the base of 64 KB of memory. If possible, replace the RAM IC. 1 long, 6 short Unable to load interrupt vectors: The BIOS was unable to load interrupt vectors in memory. 1 long, 7 short Unable to initialize video: This is a video problem. Replace the video card first. If the problem persists, replace the motherboard. 1 long, 8 short of failure memory: The is a failure in the video memory. Replace the video card first. If the problem persists, replace the motherboard. Compaq The following information is from the BIOS Compaq BIOS Beep Codes Central page. Beeps Meaning 1 short No error: The system starts properly. 1 long, 1 short BIOS ROM checksum error The contents of the ROM BIOS does not match the expected contents. If possible, reload the BIOS from the PAQ. 2 short General error: No details available on what it means code 1 long, 2 short Video error: Check the video card and make sure it is properly installed. If possible, replace the video card. 7 beeps (1 long, 1 short, 1 long, 1 short, pause, 1 long, 1 short, 1 short) video AGP: The AGP video card is defective. Reinsert the card or replace it altogether. This includes tone for Compaq Deskpro systems. Continuous beep Memory error: Bad RAM, replace and test-retest 1 short, 2 long Bad RAM: RAM Reinstall, then replace RAM if failure continues. The following information applies Phoenix Phoenix BIOS Q3. 07 or 4. x. This information is from the Phoenix BIOS beep codes section of the ComputerHope. com Computer POST / Beep Codes page. The dashes indicate pauses between beeps. Beeps Meaning 1-1-1-3 Verify real mode. Get CPU type 1-1-2-1. 1-1-2-3 system hardware initialization. 1-1-3-1 Initialize chipset registers with the values initial post. 1-1-3-2 Set in POST flag. 1-1-3-3 Initialize CPU registers. 1-1-4-1 Initialize cache to initial POST values. 1-1-4-3 Initialize I / O. 1-2-1-1 Initialize Power Management. 1-2-1-2 alternate load registers with values initial post. 1-2-1-3 Jump to UserPatch0. 1-2-2-1 Initialize keyboard controller. 1-2-2-3 control ROM BIOS initialization 1-2-3-1 8254 timer initialization 1-2-3-3 8237 DMA controller 1-2-4-1 Reset Programmable Interrupt Controller. 1-3-1-1 DRAM refresh test. 1-3-1-3 Test 8742 keyboard controller. 1-3-2-1 Set ES segment register to 4 GB. 1-3-3-1 DRAM 28 AutoSize. 512KB RAM 1-3-3-3 Clear Base. 1-3-4-1 Test 512 base address lines. 1-3-4-3 Memory Test 512K base. 1-4-1-3 Test CPU bus clock frequency. 1-4-2-4 Reinitialize the chipset. 1-4-3-1 Shadow system BIOS ROM. 1-4-3-2 Reinitialize the cache. 1-4-3-3 cache AutoSize. 1-4-4-1 Configure advanced chipset registers. 1-4-4-2 load alternate registers with CMOS values. 2-1-1-1 CPU Set the initial speed. 2-1-1-3 Interrupt vector initialization. 2-1-2-1 Initialize BIOS interrupts. 2-1-2-3 Check copyright ROM. 2-1-2-4 Boot manager for PCI Options ROMs. 2-1-3-1 Check video configuration against CMOS. 2-1-3-2 Initialize PCI bus and devices. 2-1-3-3 Initialize all video adapters in the system. 2-1-4-1 Shadow video BIOS ROM. 2-1-4-3 Display copyright. 2-2-1-1 Display CPU type and speed. 2-2-1-3 Test keyboard. 2-2-2-1 Set key click if enabled. 2-2-2-3 56 Enable keyboard. 2-2-3-1 Test for unexpected interrupts. 2-2-3-3 show the message “Press F2 to enter SETUP”. 2-2-4-1 Test RAM between 512 and 640K 2-3-1-1 Test expanded memory. 2-3-1-3 Test extended memory address lines. 2-3-2-1 Jump to UserPatch1. 2-3-2-3 Configure advanced cache registers. 2-3-3-1 allow external and processor caches. 2-3-3-3 Screen size external cache. 2-3-4-1 Display shadow message. 2-3-4-3 Display non-disposable segments. 2-4-1-1 Display error messages. 2-4-1-3 Check for configuration errors. 2-4-2-1 clock test in real time. 2-4-2-3 Check for keyboard errors. 2-4-4-1 Set up hardware interrupts vectors. 2-4-4-3 Test coprocessor if present. 3-1-1-1 Disable I / O ports 3-1-1-3 Detect and install external RS232 ports. 3-1-2-1 Detect and install external parallel ports. 3-1-2-3 Re-initialize onboard I / O ports 3-1-3-1 Initialize BIOS data region. 3-1-3-3 Initialize Extended BIOS data region. 3-1-4-1 Initialize floppy controller. 3-2-1-1 Initialize hard disk controller. 3-2-1-2 Initialize local bus hard disk controller. 3-2-1-3 Jump to UserPatch2. Online 3-2-2-1 Disable A20 address. 3-2-2-3 Clear huge segment register ES. 3-2-3-1 Search for option ROM. 3-2-3-3 Shadow option ROMs. 3-2-4-1 Set up Power Management. 3-2-4-3 Enable hardware interrupts. 3-3-1-1 Set time of day. 3-3-1-3 Check key lock. 3-3-3-1 Erase F2 “message. 3-3-3-3 Scan for F2 key. 3-3-4-1 enter Setup. 3-3-4-3 Clear-mast. 3-4-1-1 check for errors. 3-4-1-3 complete message, prepare the operating system boot. 3-4-2-1 One beep. 3-4-2-3 Check password (optional). Table 3-4-3-1 Clear global descriptor. 3-4-4-1 Clear parity women. 3-4-4-3 Clear screen (optional). 3-4-4-4 control virus and backup reminders. 4-1-1-1 Try to boot with INT 19. 4-2-1-1 Interrupt handler error. 4-2-1-3 Unknown interrupt error. 4-2-2-1 Pending interrupt error. 4-2-2-3 option ROM initialization error. 4-2-3-1 stop error. 4-2-3-3 Move extended block. 4-2-4-1 Shutdown 10 error. 4-3-1-3 Initialize chipset. 4-3-1-4 Initialize refresh counter. 4-3-2-1 Check Forced Flash. 4-3-2-2 Check HW status of ROM. 4-3-2-3 BIOS ROM is OK. 4-3-2-4 Make a complete test of RAM. Do OEM initialization 4-3-3-1. 4-3-3-2 Initialize interrupt controller. Read 4-3-3-3 in the startup code. 4-3-3-4 Initialize all vectors. 4-3-4-1 start the program Flash. 4-3-4-2 Initialize the boot device. 4-3-4-3 startup code was read OK IBM Desktop beep beep No Meaning No Power, Loose expansion card (ISA, PCI or AGP), a short or harm the earth mother 1 System OK shorts 1 long video / display problem video card badly seated or defective 2 short POST error appears on the monitor 3 Problem with long 3270 keyboard card 1 long, 1 short Problem with system board 1 long, 2 short with Problem adapter (MDA, CGA) 1 long, 3 short beeps Problem with EGA Repeat Problem with short supply or system board problem Continuous beep with supply or system board IBM Thinkpad message beep beep continuous failure of the system board with 1 beep problem LCD display connector white, non-LCD backlight inverter, the lack of video card or LCD assembly 1 error beep w / message “Unable to access boot source” boot device failure or bad system board 1 long, 2 short System board, video card, or the failure of the Assembly LCD 1 long, 4 short battery voltage low 1 beep every second low-voltage battery 2 Short W / Read the message the error message on screen 2 courts with blank billboard System failure beeps Meaning Mylex shoes 1 Normal: 2 error problems video card video card is not seated or 3 is faulty keyboard controller error Keyboard controller IC 4 Bad keyboard error keyboard itself may be bad, or the controller IC on the motherboard image 5 0 Error: The programmable interrupt controller IC is bad PIC 1 error 6: Same as above 7 Error DMA register page: DMA controller IC is bad error 9 8 RAM refresh error data RAM 10 RAM parity error 11 DMA controller 0 error: DMA controller IC for Channel 0 has no error 12 CMOS RAM: CMOS RAM 13 Bad DMA controller 1 error: DMA controller IC for channel 1 are not error 14 CMOS RAM battery: Dead CMOS battery can usually be replaced 15 CMOS checksum error RAM: CMOS RAM 16 has no error BIOS ROM checksum: BIOS BIOS RAM failed Quadtel The following information is from the BIOS BIOS Beep Codes Quadtel Central page. 1 short boot Normal: system boots normally. 2 tennis CMOS error: The CMOS RAM is faulty. Replace the IC if possible. 1 long, 2 short Video error: The video card is defective. Reinstall the video card or replace the card if possible. 1 long, 3 short peripheral controller error: One or more device controllers in the system is bad. Replace the controllers and retest. Hope you found this information useful. For more advice on fixing the other day to day computer problems, http://pcfixeasy visit. blogspot. com

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