Happened to me few weeks back, I've too remove the GPU for dust cleaning and the monitor just kept stuck in standby mode after I assembled everything. I've swap the cables, the monitors, no luck.
A friend of mine told me to reset the CMOS battery and it worked, weird :/
Just reseat it...
Paul, my new graphics card just arrived.. I fitted it in and powered the PC on however nothing showed on monitor.
You could also try the Gpu in another slot on the motherboard to see if that makes any difference.
I believe it only fits in one slot, which is the PCI-E x16 slot. I just rest the BIOS but still no result..
Are you getting any warning lights or beeps from the motherboard?
Maybe try it with just 1 stick of ram.
I am running out of ideas.
No warning beeps or lights. Do you think it could be the RAM? Before it stopped working I tried doing a RAM test but it would shut off half way through..
Quote