dyinisus :
ttcboy :
Seems like a PSU problem rather then the graphic card problem.
I took your advice and bought a brand new 460 W PSU. Removed the old one and the computer is still crashing! What else could it be? If its not the graphics card and not the PSU?
Try the steps that "rdc85" recommanded.
Are you still using the old graphic card or using the new card ? coz if u r still using the old card, ur previous PSU might done some damage to it.
My advice is to RMA ur graphic card and try again. If the problem persists, there is only one culprit left and that's ur Motherboard but as far as my experience goes, it is rarely the case.
Make sure to clean ur PCI-E slot with air blower and seat the card properly. After you power on the PC, check whether the fan on the card are running as well.
Another question is that u mentioned that ur old galaxy card work for a few months, so, that time, u r using Vista , win 7 or win 8 ? coz if you upgrade from Vista/win 7 to win 8, u have to re-install all the chipset drivers for your motherboard and if u miss out, some device will not work properly that .
I noticed from the HP website that your machine original OS is Vista and can be upgrade to Win7 but on the driver support page, i can only see the Vista drivers and not even the Win7 drivers which in my opinion, HP won't have any win 8 chipset drivers for this machine.
Just do a quick check and found that ur
motherboard is using intel G33 chipset
and it is not supported under Win 8
in Intel website.
Is there anyway for u to revert back to vista or Win7 and test the system again ? The problem might be due to lack of proper chipset driver and at the mean time, pls update ur bios to latest version as well.