Slow boot after GPU upgrade

[bgabor]

Hey guys,

 

Today I finally upgraded my Gigabyte GTX 650 to an Asus GTX 970. It does work very well, but only after the PC finally starts up. When I turn the PC on, the BIOS splash screen comes up and I hear one short beep, which according to the manual means no problems detected, but nothing happens. The splash screen remains there, but I can't do anything, can't even enter the BIOS. After about 20-30 seconds there's another short beep. There are a total of 4 beeps, 20-30 seconds from each other. On the 4th beep my screen goes black and comes back after a few seconds with Windows loaded.

I removed the GPU and connected my monitor to the integrated intel GPU and it worked perfectly. Put the 970 back, same as before.

I already reset the CMOS with the onboard pins but that didn't solve the problem either.

Do you guys have any idea?

 

Specs:

Gigabyte GA-Z77-DS3H

Intel 3570K

ASUS STRIX GTX 970

Corsair Vengeance 2x4 GB 1600MHz

Corsair CX 600

120 GB Samsung 840 EVO

1 TB Caviar Black

Windows 8.1 64-bit

 

Thank you in advance!