My computer does nothing, I see screen, just blank but I hear the fan running and lights flashing on the keyboard and a few beeps. What could be the problem? At startup, computers perform a Power-On Self Test, commonly known as POST. If problems are detected at boot, you can usually diagnosed 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 that a service technician should correct them. But to start, if you see the keyboard lights flash twice, this does not mean your computer motherboard works well. Otherwise you can absolutely diagnose the cause to be something wrong with the components of the motherboard. Many BIOS have different beep codes, even if they appear to come from the same manufacturer. Because codes motherboard manufacturers reprogrammed to reflect their own customizations. You can often go to the website of manufacturer of the motherboard to find the updated code, but you may find cases where the manufacturer simply has no information about the change. Award Award BIOS typically use multiple screen error codes beep. For Award BIOS made by Phoenix Technologies, note the following from the Phoenix Technologies AwardBIOS page error messages: “The only AwardBIOS beep code indicates a video error has occurred and the BIOS can not initialize the video screen to view additional information. This beep code consists of a single long beep followed by two short beeps. The other beeps are probably RAM (Random Access Memory) problems. “Award BIOS are not manufactured under Phoenix Technologies used following the beeps and this information is the central page of the BIOS Award BIOS Beep Codes: Beeps Meaning 1 long, 2 short Video adapter error: Bad or improperly installed video card error beep Repeat memory or Bad improperly installed RAM 1 long, 3 short video RAM Bad video card or high-frequency beeps not this CPU Overheating: Check fans Repeating High / Low beeps CPU: improperly installed or faulty CPU AMI (American Megatrends) The following information is the central AMI BIOS beep BIOS Beep codes pages and what do they mean? 1 short DRAM refresh failure 2 short Parity circuit failure in the first 64K of RAM: Likely a bad RAM IC, or perhaps a hardware tests has failed 3 No-memory runs in the first 64K of RAM: Likely is an IC RAM failure 4 short System timer: Bad clock IC or bad RAM in the first bank of memory 5 short Processor Error: The processor has failed. Short error 6 Keyboard controller Gate A20: The keyboard controller has failed. Through its integration into the system board, you will typically replace the motherboard. 7 Short Virtual mode exception error: CPU has generated an exception error, bad CPU or motherboard 8 short Display memory read / write test failure: video card Bad 9 short ROM BIOS checksum failure : BIOS is defective 10 short CMOS shutdown read / write error 11 short Cache error: Specifically, the L2 cache is bad. 1 long, 2 short video system failure: error in the BIOS of the video card, or a horizontal retrace failed 1 long, 3 short Conventional failure of extended memory: RAM is bad 1 long, 8 short Display / Retrace test failed : Video adapter AST BIOS is defective or missing following information is from the central AST BIOS BIOS Beep Codes page. Meaning 1 short beep test CPU register failure: The CPU has failed. 2 short keyboard buffer controller failure: The keyboard controller has failed. 3 short reset the keyboard controller failure: The keyboard controller has failed or the circuit of the motherboard is faulty. 4 short Keyboard communication failure: Bad keyboard or keyboard controller failure 5 short Input Keyboard: The keyboard controller IC has failed. 6 Short chipset system failure: the chipset of the 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 Test System timer failure: The system clock IC has failed. 11 Short ASIC failure: Motherboard circuitry has failed. Replace the motherboard. 12 Short CMOS Shutdown register RAM failure: The real time clock / CMOS IC failed. Replace the CMOS or motherboard. 1 long DMA controller 0 Claim: The DMA controller IC for channel 0 has failed. If possible, replace the IC. 1 long, 1 short of the 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 Memory test failure Video: The memory video card has failed. Replace the video card. 1 long, 4 short failure of the video adapter: The video card has failed. Replace the video card. 1 long, 5 short 64KB memory failure: A failure occurred in the database 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 the interrupt vectors into 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 video memory failure: The failure is in the video memory. Replace the video card first. If the problem persists, replace the motherboard. Compaq following information is from the Central BIOS Compaq BIOS Beep Codes 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 on what this code means 1 long, 2 short Video error: Check the video adapter and ensure it is properly in place. 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. Reinstall the card or replace it outright. The beep on Compaq Deskpro systems. Beep error continues Memory: Bad RAM, replace and test 1 short, 2 long Bad RAM: Reseat RAM then retest; replace RAM if failure continues. Phoenix The following information applies to Phoenix BIOS Q3. 07 or 4. x. This information is from the Phoenix BIOS codes section ComputerHope beep. 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 Initialize system hardware. 1-1-3-1 Initialize chipset registers with initial POST values. 1-1-3-2 Set 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 Load alternate registers with initial POST values. 1-2-1-3 Jump to UserPatch0. 1-2-2-1 Initialize keyboard controller. 1-2-2-3 BIOS ROM checksum 1-2-3-1 8254 timer initialization 1-2-3-3 8237 DMA controller initialization 1-2-4-1 Reset Programmable Interrupt Controller. 1-3-1-1 Test DRAM refresh. 1-3-1-3 Test 8742 Keyboard Controller. 1-3-2-1 Set ES segment register to 4 GB. 1-3-3-1 DRAM Autosize 28. 1-3-3-3 Clear 512KB base RAM. 1-3-4-1 Test 512 lines of the base address. 1-3-4-3 Test 512K base memory. 1-4-1-3 Test CPU bus clock frequency. 1-4-2-4 Reset chipset. 1-4-3-1 Shadow system BIOS ROM. 1-4-3-2 Reset the cache. 1-4-3-3 cache AutoSize. 1-4-4-1 configure the chipset registers. 1-4-4-2 Load alternate registers with CMOS. 2-1-1-1 Set Initial CPU speed. 2-1-1-3 Initialize interrupt vectors. 2-1-2-1 Initialize BIOS interrupts. 2-1-2-3 Check ROM copyright notice. 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 notice. 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 interruptions. 2-2-3-3 show the message “Press F2 to enter SETUP”. 2-2-4-1 Test RAM between 512 and 640KB. 2-3-1-1 Test expanded memory. 2-3-1 — 3 Test address lines extended memory. 2-3-2-1 Jump to UserPatch1. 2-3-2-3 Configure advanced cache registers. 2-3-3-1 Enable external and CPU caches. 2 — 3-3-3 Screen size external cache. 2-3-4-1 Display shadow message. 2-3-4-3 display disposable segments. 2-4-1-1 Display error messages. 2-4-1-3 Check for configuration errors. 2-4-2-1 Test real time clock. 2-4-2-3 Check for keyboard errors. 2-4-4-1 Establishment hardware interrupts vectors. 2-4-4-3 Test coprocessor if present. 3-1-1-1 Disable onboard 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 I / O ports 3-1-3-1 Initialize BIOS Data Area. 3-1-3 -3 Initialize Extended BIOS Data Area. 3-1-4-1 Initialize the floppy controller. 3-2-1-1 Initialize hard disk controller. 3-2-1-2 Initialize local-bus hard-controller disc. 3-2-1-3 Jump to UserPatch2. 3-2-2-1 Disable A20 address line. 3-2-2-3 Clear huge ES segment register. 3-2-3-1 Search ROMs option. 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 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 in-POST flag. 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). 3-4-3-1 Clear global descriptor table. 3-4-4-1 Clear parity checkers. 3-4-4-3 Clear screen (optional ). 3-4-4-4 Check virus and backup reminders. 4-1-1-1 Try to boot with INT 19. 4-2-1-1 Interrupt handler error. Unknown 4-2 -1-3 interrupt error. Pending interrupt error 4-2-2-1. 4-2-2-3 Initialize option ROM error. 4-2-3-1 failure of stop. 4-2-3-3 Extended Block Move. 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 for Forced Flash. 4-3-2-2 Check HW status of ROM. 4-3-2-3 BIOS ROM is OK. 4-3-2-4 Do a complete RAM test. 4-3 — 3-1 Do OEM initialization. 4-3-3-2 Initialize interrupt controller. 4-3-3-3 Read in bootstrap 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 Boot code was read OK IBM Desktop beep beep No Meaning No electricity, expansion card Bulk (ISA, PCI or AGP), a short or harm the earth-mother 1 short System OK 1 long video / display problem, video card seated properly or defective 2 short POST error appears on the monitor Problem 3 3270 along with keyboards, 1 long, 1 short problem with the system board 1 long, 2 short problem with adapter (MDA, CGA) 1 long, 3 short problem with EGA Repeating short beeps problem with power supply or system board beep Continuous Problem with power supply or system board IBM Thinkpad beeps continuous beeps Message System failure map 1 beep LCD connector problem white LCD inverter backlight fails, the default video card or LCD failure Assembly 1 tone w / message “Unable to access boot source” Boot device failure or bad system board 1 long, 2 short motherboard, video card, LCD or failure of the Assembly 1 long, 4 short and low battery voltage 1 beep every second Low voltage battery 2 Short W / Read the message error message on the display 2 display with short white card system beeps Meaning Mylex fail to boot Normal 1: No problems 2 error video card: Video card is not seated or is defective 3 Keyboard controller error: Keyboard controller IC bad 4 Standard keyboard keyboard itself may be bad, or the IC controller on the motherboard 5 PIC 0 error : The programmable interrupt controller IC is bad 6 PIC 1 Error: Same as above 7 DMA Page Register Error: DMA controller IC is Bad 8 Error 9 RAM refresh RAM data error 10 Error parity RAM 11, DMA controller 0 error: DMA controller IC for channel 0 has failed 12 CMOS RAM Error: 13 Bad CMOS RAM DMA Controller 1 error: DMA controller IC for channel 1 has failed 14 CMOS RAM battery error Dead CMOS battery, can generally be replaced checksum error 15 CMOS RAM: CMOS RAM 16 failed BIOS ROM checksum error: BIOS RAM failed Quadtel BIOS The following are the central Quadtel BIOS BIOS Beep Codes page. 1 short of normal startup: system boots normally. 2 short CMOS IC error: CMOS RAM is faulty. Replace the IC if possible. 1 long, 2 short Video error: The video card is defective. Reseat the adapter or replace the card if possible. 1 long, 3 short peripheral controller failure: One or more system controllers device is bad. Replace the controllers and retest. Hopefully you found this information useful. For more advice on fixing other day computer problems day visit http://pcfixeasy. blogspot. com