Question No Signal

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May 16, 2020
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Specs:
MOBO - GA-78LMT-S2P
AMD-FX 6100
2x4GB DDR3 RAM
HD Radeon 7770 & GTX 950 OC
PSU - AYWUN Mega Power Elite 750

I get no signal to monitor when plugged into my gpu, but when connected to mother board I get signal, I thought my Radeon HD 7770 card had died so I bought a - Gigabite WINDFORCE GTX 950 OC
2nd Hand. But was said to be good condition and not used too long.

I thoroughly cleaned the computer of dust, unplugged mother board, CMOS and ran each RAM stick separately. Installed the GTX 950.
After this it worked for about 8 hours then I turned the pc off to install a sound card and now it is back to no signal to gpu. (mobo still gets signal only when the gtx 950 isn't installed)
Possible causes:
  • PSU faulty (I don't know how to test this)
  • motherboard issue (is it the PCI-E slot?)
  • windows? bios? (not sure)
anyone ran into this problem before? looking for some help. Cheers
 
May 16, 2020
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Update, everything re-tested.
  1. Firsted I used a power suppy tester, my power supply has the correct voltage with each connection.
  2. Secondly I cleaned and tested each RAM stick seperately, as well and ran Windows Mem diagnostic tool. 100% fine.
  3. Ran with GTX 950 in and it worked until I turn off pc or restart then immediately no signal again.
  4. Updated to windows 10, works fine, no errors or bios issues.
  5. Currently dont have 2nd pc to test both graphics cards, so looking to test this next.
Question : If both cards end up working without problems, is it the motherboard pci express slot that is faulty, or could a power supply that passed a PSU tester randomly become faulty?
If so I shall just buy another PSU thats a good brand coolmaster or corsair 550w.
(PS - My graphics card doesnt show up in device manager everytime I get no signal.) not sure what this means.
any replies would be appreciated.
 
May 16, 2020
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Update.
Brand new corsair 550w psu, still same issue.
PC runs fine with motherboard graphics in.
Tried 3 different working graphics cards in the pci express slot and no signal each time. My assumption is the motherboard is the issue. Is there any way I can fix this or do I buy another motherboard off Ali express, only place I can order one.
Never had motherboard issues before so I dont know for sure any advice appreciated.
 
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