No display while the gpu is plugged in monitor, but onboard gpu works fine

Zinox12

Honorable
Mar 4, 2012
9
0
10,510
Since last week, my pc was stuck on a black screen when I started it (the motherboard beeps once so I guess it posts successfully, even though I don't see anything?) , I had to restart it several times until it finally worked. But today I kept restarted it for like a hour...so I gave up and plugged my monitor in the onboard gpu, and it displayed the post screen, but once it got to the loading windows screen, the hdd light stayed off, and it kept loading forever.

So I removed the motherboard's battery to clear CMOS and now it starts and works normally with the onboard gpu. But if I plug the gpu in my monitor, I get no display at all. Apparently the monitor does get signal from the gpu because it acts like the pc is turned off, also, the gpu fan is spinning normally.

I've already set the primary gpu setting in bios from onboard to pci express but it didn't change anything. Is my gpu dead? If yes, why several days ago it eventually worked after several restarts? I'll see if I manage to test the gpu in another pc.
 

MB: ASRock N68-GS3 UCC
GPU: AMD Radeon HD 7750 1gb GDDR5
CPU: AMD Phenom II X2 555
RAM: 6 GB
PSU: nJoy Titan 500, 500W

I've forgot to add that I've already tried using each stick of ram in different slots, tried another PSU, and another hdd. But it was still stuck at a black screen.

 
I've tried the gpu at a friend's pc and he also gets a black screen with it. And I've tried his gpu in my pc and it works fine, so in the end, my gpu is most probably dead.
Ah well, at least I have a spare 5450 lying around, so I'll use this one until I upgrade my pc. :/