Video and USB device loss

[Wasabisushi128k]

I am running Win 7 64 on a built PC. I had a gforce 9500 and 4 gigs of RAM on a Asus M4A77TD mobo. I upgraded to a GTX 550 Ti 2g and 8 gigs of 1600 RAM.

Just before I upgraded and the partial reason for the upgrade was the 9500 was making a weird grinding sound and the com started losing signal to the video card and the usb connections (Keyboard and mouse).

I thought installing the new equipment would fix the issue, but alas it has not. Its not after anything specific that it happens. I was running a game for 2 hours and it happened, I also left my comp on over night and it happened when I got up in the morning. It would seem to be more a time or length of time the computer is on that it will happen.

Any thoughts, help or solutions?

Thanks guys!

 

[SNGX1275]

You put in a lot better graphic card and you increased the RAM.

Still on the same power supply?

Thats my thoughts, replace the power supply with something good.

 

[Wasabisushi128k]

Actually the PS I originally had in there was replaced way before any of this from a 450 to a 600w decent PS.

 

[SNGX1275]

Well, ok then.

Sorry I'm not any more help, but it just sounded, originally, like a lack of power issue. If you are sure you have enough power then I'm out of helpful advice. Hopefully someone else will respond.

 

[Wasabisushi128k]

No I appriciate the help, and any ideas are helpful. I'm just stumped. Recent turn of events, now it turned off video and usb connections and when I went to flick the master power in the back and turn it back on all the lights and fans clicked on for about .100ths of a second and then It wouldn't power up. When I unplugged the power to the Mobo and plugged it back in the computer then restarted and only had 3 of the 4 cores active on my processor. When I went into bios to activate the 4th as soon as I clicked f10 to save and exit, the whole comp turned off and wouldn't turn on.