Problem. PC Shuts Down

Hello,

Yesterday I upgraded my CPU and Video Card.

from a Pentium D 2.8Ghz, upgraded that to C2D 2.9Ghz. and from a 8600GT xxx edition 256mb ddr3 I updgraded to a 9800gt 1gb ddr3.

now my PC shuts completely down without errors, warnings, blue screens nothing, just completely shutdowns like if there was a power outage.

As per the manual the vid card requieres a psu of min 400W, I have a 680W PSU unit. Computer starts fine, but I noticed that if I try to use something that uses heavy graphics thats when the shutdown occurs., two examples:

1. I tried refreshing the windows experience index, and it shuts down right in the middle during a direct 3d ALU test, everytime..

2. tried loading BFBC2 and shuts down when trying to enter a multiplaye server.

this leads me to believe it might have something to do with either a faulty PSU unit, or faulty Vid Card (doubts on the latter).

As for Drivers I uninstalled and reinstalled everthing twice now and even resintalled Direct X just in case.

Although it seems I have the possible problem pinned down I would still like to read your comments and suggestions...maybe I missed something ?

PC specs:
-Core2Duo 2.9gz
-Vid: 9800GT 1gb DDR3
-3gb RAM pc 667 (planning on upgrading that soon)
-Motherboard: Asus P5N 650i Sli board
-680PSU unit
-LG 22" Widescreen
-HHD: 320gb 7200rpm
-DVD Writer
-Windows 7 64bit Ultimate (legal)

Tks

Eric

Thanks guys.

1. I'll try disconnecting and connecting everything again.
2. I checked Asus's website and for the C2D I have installed I requiered min 1301 version, I have 1404 installed, but will try to install the latest one.

will revert

Did you restore BIOS defaults before and after installing the new CPU?

I'd like to add that it can be important, particularly when upgrading a BIOS, to restore BIOS defaults before you flash the BIOS, and after the BIOS flash. This redundancy is a simple procedure that can avoid the occasional strange behaviors that can occur when flashing a BIOS.

Also one of my cardinal rules of upgrading hardware or software: never more than one component or change without reboot and test.

hi guys,

Well tried everything suggested.

1. disconnected and reconnected everything again
2. loaded defaults in bios and cleared cmos
3. updated bios with the latest
4. did a ram test (which shut down the machine about 1/3 of the progress)
5. thought it was ram, so I bought new ram, didnt work either
6. reinstalled direct X
7. reinstalled all hardware drivers
8. resintalled my old vid card just in case

I did get some where, after I reinstalled DX (I downloaded the large +100mb file from MS) it actually almost finished (progress bar was right next to finishing) the windows experience index, right when I though "voila it was fixed" the machine shuts down....

any ideas ? could this be something related between the DX version and the new vid card?

tks

/Eric

You've put so much time and money into this thing, why not do a thorough rebuild? Pull everything out of the chassis (shag carpet and socks not recommended) and then carefully reinstall.

Also - what kind of cooling are you running?