Question Sudden no signal to monitor, GPU tested and working fine

Mar 2, 2020
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PC Specs:
Windows 7
GTX 1060 3GB
AMD FX-6300 3.50GHz
16GB RAM
600W PSU

I've had this pc for years, woke it up from sleep and suddenly had no signal to monitor. The pc boots and works perfectly with a different graphics card and when the display is plugged into the motherboard. I assumed the graphics card just died so I sent it in for repairs but turns out it's working flawlessly in other systems.
I get no BIOS beep when the card is in the system but the fans still spin when it's booting. I've tried different video cables, resetting CMOS, checked if BIOS prioritised the PCIE slot, different RAM sticks, cleaning dust etc. Never had any problems with it before and was gaming on it before I put it to sleep.