Power/Consistency Issues

[Oboro]

Hey guys and girls,

I built a new computer this past weekend and since then have had some trouble trying to keep the computer running. It's not a problem getting it running but keeping it running, I can sometimes start it up and it will load up fine but within 5 minutes of surfing the web it shuts off (however the fans keep running). More recently it has taken me 3 or more resets to get the computer to start up so im not sure whats going on. Also, whenever someone is walking in the room the computer shuts off.

I've built and rebuilt followed all the instructions but cant understand what is wrong. Heres a list of my equipment, any suggestions you all could offer would be greatly appreciated. I'm running Windows Vista Ultimate 32-bit.

Creative 70SB046A00000 7.1 Channels PCI Interface Sound Blaster X-Fi XtremeGamer Fatal1ty Professional Series - Retail

Pioneer 20X DVD±R DVD Burner Black IDE Model DVR-115DBK - OEM

Seagate Barracuda 7200.11 ST31000340AS 1TB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

Intel EXPI9300PT 10/ 100/ 1000Mbps PCI-Express Gigabit Performance to the Desktop - Retail

CORSAIR CMPSU-750TX 750W ATX12V / EPS12V Power Supply - Retail

ASUS M3A32-MVP Deluxe AM2+/AM2 AMD 790FX ATX AMD Motherboard - Retail

AMD Phenom 9950 BLACK EDITION 2.6GHz Socket AM2+ 140W Quad-Core Processor Model HD995ZFAGHBOX - Retail

ATOP Decorative AT-AP102-BK Black SGCC Steel ATX Mid Tower Computer Case - Retail

G.SKILL 2GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model F2-6400CL5S-2GBPQ - Retail X2


Thanks,

-Dave

[JPMiller]

Since there are no glaring issues that pop out from your list of parts, the next thing to check is connections
It sounds as if something is loose or partially disconnected
make sure your power strip/surge protector is good, then make sure all cables and connections are fully inserted and stable, then make sure all the cards are fully seated
It could also be the motherboard shorting out on the case
Rebuilding the PC outside the case would rule that out
Make sure there are only the risers that match the mobo layout installed under the motherboard

[#43 fan]

It may be also a heat issue, possibly due to the CPU cooler not having good enough contact with the CPU.
I take it you used the included cooler that came with the CPU? If so, did it come with a Thermal Pad, or did you need to apply thermal paste?

[Oboro]

I've checked the connections a couple of times and everything seems to be in order there. However, when i got the mobo the risers were missing from the box so i went to the local computer store and bought a pack of generic screws/risers. There were two riser sizes: large and small and i opted to use the large. Not sure if that could be causing the problem?

And the CPU cooling fan did come with a thermal pad on it which molded to the cpu nicely. I did however buy some thermal compound just in case i would need it so if you think that would help i could add some to the cpu.

Thanks for the replies guys,

--Dave

[JPMiller]

I suggest setting everything up outside the case...
That will eliminate the possibility its a short somewhere

[Oboro]

Alright, i'll try that and let you guys know how it works out. If you don't hear from me later tonight.... it didnt work .

Thanks again,

--Dave