Solved Newly installed 980, unable to boot (safe mode freezes at classpnp.sys

[BingoGaming]

Just got a GTX 980 (Asus reference) and when I've got it installed it freezes at "Starting Windows" and I have to hold the power button it to restart it.

When trying to boot to safe mode, the computer hangs on classpnp.sys

I know it's not the graphics card as it boots on my friend's computer and I know it's not a huge deal with the computer as when I reinstall my EVGA GTX 660ti the computer boots fine.

Any ideas? I've made sure it's properly seated with the 2x6pin inserted correctly. I've also tried reinstalling the geforce experience drivers.

 

[Golden]

Have you tried running a Starup Repair

http://www.sevenforums.com/tutorials/681-startup-repair.html

 

[BingoGaming]

Just tried that, when it comes up Windows is Loading Files it freezes and I have to restart again.

 

[rustberger]

Try uninstalling all nvidia drivers before changing cards

 

[BingoGaming]

Found the problem, BIOS was in update F11 so I read up and found that update F16 improved VGA compatibility so I downloaded and installed update F18 and that fixed all my problems.