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No signal to monitor after installing GPU

Specs
Mobo: Gigabyte b75-d3v
CPU: intel i5 3470
RAM: Corsiar vengence 8GB
HDD: Seagate 500 gb sata 3
PSU: 430w
GPU: Gigabyte 7850 OC 2GB

For whatever reason when I install the GPU my computer gives no signal, however the fans on the mobo still run.

I've tried a different GPU and that worked, I have tried a 500w psu and that failed.

I have tried unplugging all other components not needed to boot to test if the psu is powerful enough, which still lead to no signal.

I have tried the gpu in a different computer with a 400w which worked.

I also tested in a computer of similar specs with a 500w psu and asus h61 mobo which didnt work either.

I hjave also tried installing all the drivers and also went into bios and set it to pci express which didnt work.

I have no idea what it could be, it appears the gpu works, there is enough power and it is compatible with the mobo yet it dosnt work.

Please help.
7 answers Last reply
More about signal monitor installing
  1. boot using the i gpu and update the BIOS of your mainboard...see if that works
  2. I cannot boot with the gpu in, I tried updating it but during the download it crashed and I decided it was too risky
  3. How come a 400w worked fine then?
  4. bare in mind it was an unbranded £10 psu
  5. my psu is a corsair 430w
  6. bump
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