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System skips Posts / Black Screen for 2 mins then 'Starting Windows' Screen after installing GTX 780

Hey there, as on the screen.

I just bought and installed my ZOTAC AMP! GTX 780 to replace my GTX 680. Doesn't Posts diagnostics or can say, it starts with black screen for 2 minutes before the Windows Splash screens come up after installing a GTX 780. I did a few tests in a few scenarios and I find it funny. Could this be a BIOS or would it be best to clear CMOS (either Via Jumper or Removing battery)?

I have a few scenarios after trying in 2 of my rigs.

ASUS P8P67M-Pro - the primary Mobo for my current rig, BIOS 3602
Test 1: GTX 780: Black Screen 2 minutes then 'Starting Windows'.
Test 2: GTX 680, boots normally and quickly, no problem.
Swapped GPUs again, same story.

But then the funny bit

ASUS P8P67 Pro - Backup Rig, BIOS 1502
Test 1: GTX 780 - Boots no problem
Test 2: GTX 680 - Boots no problem.

Coould this be a BIOS problem? Cause' the 3602 doesn't work normally but the 1502 does.
Some help would be appreciated! Many Thanks!
5 answers Last reply Best Answer
More about system skips posts black screen mins starting windows screen installing gtx 780
  1. Best answer
    Yes, flash it with 3701.
  2. Or something quirky going on with the PSU for example. But bios update might solve it.
  3. rvilkman said:
    Or something quirky going on with the PSU for example. But bios update might solve it.


    I do have 2 PSUs to test. 1 Corsair HX-1000 and 1 CoolerMaster 650W. But I highly doubt it could be the cause and it'd be a pain to disconnect the PSUs because one's a Modular and the one isn't.

    Looks like I need to get out the GTX 680 to flash the BIOS because I can't excess the BIOS in any way with a Black Screen.
  4. Yeah! The problem has been solved! All it was needed was flashing the BIOS to 3701. I was abit wary because this was actually my first time that I'd ever flashed my BIOS successfully; who knows what will happen if you brick it by accident lol.

    Now my system posts the way it should nice and quick!
  5. Good to hear that!
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