Computer shuts off when booting up

[BBCMember]

I client who has the following issue:

I recently moved and when I hooked everything back up - it wouldn't
boot up. It turns on, it runs through BIOS, but shuts itself off.
It turns off at different points of BIOS. I've gotten to the Windows
XP is starting up page once or twice, but it usually dies before then.

I tried unhooking everything that was unnecessary both inside the
computer and peripherals. I tried a different hard drive. I tried
using a different power supply. I tried plugging it directly into
the wall with nothing else plugged into the outlet. Is there
something you can suggest that I try myself? If not, do you think
this is something that can be repaired?

Here's a list of components installed:
Mother board - ECS 945P-A, Socket 775, DDR2 667
Processor - 3.0 GHz Intel P4 531-HT
RAM - Kingston 1GB stick (DDR2 PC4200)
Network - PCI ethernet adapter
Sound card - Creative Labs SBLive!
Video card - XFX GeForce 7950GT (PCI-Express)
Power supply - 600 Watts, 24 pin
Hard drive - Western Digital 250GB (sata)
Multimedia drives - Plextor CD-R
LiteOn DVDRW

I would have thought it was the PSU, but they already tried replacing that. Hopefully the replacement was a known working psu. Not sure what they tried another HD if it was a blank one that they tried to format and install the OS onto, or if they just used a HD that already had an OS on it.

In any case, what could it be? Virus/spyware/malware? Hardware?

 

[robisbell]

well, I'd checked the voltages from the 1st PSU and this replacement, 1st.
then I'd start reseating all the memory, cpu, video card, power connectors, etc...

 

[vanvock]

Check the cpu heat sink closley, it may have got knocked loose during the move.

 

[BBCMember]

OK. Thanks. Will do.