This is the crux of the homebuilder's dilemma. You've spent weeks selecting components, ordering them, painstakingly assembling a computer, and now the thing doesn't turn on. But you have no one to turn to since you built it yourself. Generally, the diagnosis is fairly straightforward, it depends on how far the computer gets into the boot process.
Try starting the system with only the following connected: motherboard power, case power switch (or motherboard power switch for ATX), speaker, CPU, memory, video card. Disconnect/remove all other peripherals.
Symptom Probable Causes ======= =============== No power (power motherboard shorted to case, supply fan does ATX power switch not connected, not spin) power supply bad
Power, no video, speaker not connected, motherboard shorted to case, no POST beeps CPU not seated, m/b power connector reversed Power, POST beeps, memory improperly seated or wrong type, video card no video improperly seated or bad. See BIOS manufacturer's web site for translation of beep code, or http://www.pcguide.com/ts/x/sys/beep/index.htm Power, no beeps, incorrect motherboard jumper settings, incorrect BIOS video, no error parameters - select "power on defaults" from BIOS message setup menu Power, no beeps, see http://www.pcguide.com/ts/x/sys/booterr.htm error message for translation of error message Power, no beeps, disk CHS parameters incorrect, incorrect translation "missing operating mode (LBA/ECHS), hard disk not partitioned and/or system" message formatted, system files missing or corrupt
See the following for a very detailed boot troubleshooting procedure: http://www.pcguide.com/ts/x/boot/quick.htm. Here's another analysis procedure: http://www.computercraft.com/docs/pcanalysis.html
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