Primary PCI-E x16 slot no longer detecting video cards after 7870 install attempt

Greetings, I recently purchased a PowerColor 7870 Myst Edition to replace my 5770. When I attempted to boot the system with the 7870 installed, I got a beep code (one long three short) indicating that the system was not detecting a video card. Puzzled, I tried re-installing the 5770 back into the primary PCI-E x16 slot and I was greeted once again with the beep code. The card had been working perfectly in that slot not even 30 minutes prior!

I then tried installing the 5770 into my secondary PCI-E x16 slot (which runs at x4) and I was able to successfully boot. With the 5770 working again, I then swapped it out with the 7870 and while I no longer got the beep error code, the system would not post (the short beep indicating a successful post never happens). So, I'm back on the 5770.

My system is as follows:
PSU: 550W Antec Truepower 2.0
CPU: Phenom II X4 965
Mobo: ASUS M4A78 Plus
HD: two 320 GB drives

I've reseated/reinstalled the cards multiple times, cleared the CMOS, and reseated the other components in my system just to be thorough. I suspect that I will need a new motherboard, but I thought it'd be best to get more opinions before I spend the cash. Really puzzled about this and I'd sincerely appreciate any suggestions. Thanks!
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More about primary pci x16 slot longer detecting video cards 7870 install attempt
  1. Could be that you fried your card with ESD when you installed it, rendering it and the slot inoperable.
  2. doubletake said:
    Could be that you fried your card with ESD when you installed it, rendering it and the slot inoperable.

    I'm always very careful to touch my case before I touch any of my components, so I don't think that's the cause. Then again, I've never lost a component to ESD so I wouldn't recognize it if it did happen! So, the card could be dead as well, darn. Unfortunately I don't have another system capable of installing the card so I've no way to test it.
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