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Problems after installing new card

Last response: in Graphics & Displays
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January 9, 2011 12:41:16 AM

Hi, I'm new to these forums. I'm having a bit of trouble with my computer at the moment. Since installing a new graphics card (Gigabyte GTX 460 1GB OC, replacing an MSI 4670 512MB), I have been having a problem powering on my system. Sometimes I have to press the power button 3 or 4 times before it starts.

My System is:
Gigabyte MA770-US3 rev.1
AMD Athlon X2 7750 Black Edition
2x2 GB Kingston DDR2-800 RAM
Western Digital Caviar Green 808.88GB HD
Antec Two Hundred Case w/ 4 fans
Great Wall 700W power supply
Two optical drives

Your assistance would be greatly appreciated.
a b U Graphics card
January 9, 2011 1:50:55 AM

Do you have a spare power supply lying around or a friend's you can borrow to test?
January 9, 2011 2:35:58 AM

Unfortunately, I can't get a spare. Something else that I didn't mention previously is that when the system finally powered up successfully, a message popped up saying along the lines of "BIOS checksum error", and the system started restoring the primary BIOS data from the secondary BIOS. Would that have anything to do with it? Should I maybe flash the BIOS with an updated version?

Also, once the system is running, I don't have any problems.
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a b U Graphics card
January 9, 2011 12:10:48 PM

Yeah go ahead and flash a new BIOS in it might fix the problem. Did you connect the PCI-e power cables because the 4650 wouldn't require it but the 460 would. This reminds me on the power supply how many watts is the 12v rail rated to carry safely?
a c 1308 U Graphics card
January 9, 2011 12:19:26 PM

That PSU has dual +12volts at 18amps each, that is way to low for a 700watt supply (more like a modern 400watt). Most likely lack of power is your issue GPU's do not corrupt BIOS but low voltage will!
January 10, 2011 10:21:17 PM

Thanks for the help mister g and rolli59. I'll begin searching for a new PSU and be sure to check out some reviews before purchasing it. Hopefully that'll solve the problem. :) 
January 12, 2011 10:18:02 PM

Replaced the power supply with an Antec TruePower 650W. The problem still occurs. =(
a b U Graphics card
January 13, 2011 2:20:25 AM

Did you flash a new BIOS in? Also check that the wires between the card that controls the power button is securely attached to cables conecting it to the motherboard.
January 13, 2011 10:02:35 PM

I flashed the BIOS, but when the problem started occurring again, the BIOS Checksum Error popped up again on boot, and the backup bios overwrote the primary bios with the older version. I opened up the computer, disconnected everything, connected everything again, and the problems still occurred.
a b U Graphics card
January 13, 2011 11:39:04 PM

It's unlikely but does your PC boot up fine woithout the graphics card?
a c 1308 U Graphics card
January 14, 2011 12:07:34 AM

Do you still have the old card to try it?
January 16, 2011 9:46:25 AM

I tried it with the old card, the problem still occurs. I've never had a problem booting up the system until now. :( 
a c 1308 U Graphics card
January 16, 2011 1:56:14 PM

We know it is not the PSU or the GPU now. It is starting to point to the motherboard and/or case connections.
!