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Here is a simple checklist that i perform whenever i get that happening to me. I try each one in turn, attempting to start the system after each step
1: Remove the CMOS battery for 30 seconds or use the jumpers to reset the BIOS. ENSURE that the BIOS reset jumper is in the correct position (Its so embarrassing when you let that one get past you :P)
2: I'm presuming you are using an ATX motherboard, give the wires on the ATX power connector a wiggle. Sometimes they don't connect to the motherboard that well and need "Repositioning"
3: Does the motherboard need the 4 pin AUX power connector? And have you plugged it in? (Some intel systems need this connector to power the cpu, i have forgotten it quite a few times myself :P )
4: Take the memory out and try it in another slot or swap it for one that you know is defiantely working if possible.
5: Remove any aditional cards that are in there, Sometimes something as simple as a soundcard, scsi card or other addin card not seating properly can halt a system.
6: Check in the motherboard manual to make sure that your PSU is capable of running the system.
7: Sit in a corner and re-read the manual- you may see something you had missed previously
8: Re check all the jumpers are set in the same position (I do this last because my fingers were not made for switching jumper positions!!)
If all that fails then take the CPU and memory to a friends house and try it in their computer- or try their hardware in your computer. If you are using hardware that none of your friends are using then take the cpu and memory to a reputable shop for testing (Are any computer shops reputable???)
I don't know what your level of computer skills are so if you have tried all the above ignore me :P
Some reasons i have had for no display and/or post beep:
Faulty CPU/CPU not seated correctly
Incompatible Memory/Memory not seated correctly
Faulty motherboard
Motherboard not mounted in chassis correctly (Wasn't sat on mounting legs, i didnt build this one- it was brought in for repair)
Addin card not seated correctly
PSU too small
BIOS reset jumper incorrectly placed
CPU multiplier/voltage/speed set incorrectly (Both jumper and bios controlled boards)
Voltage incorrectly set on PSU
If i think of anything else i will put it here- hope this helps
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