So I went to clean my pc today, it is six years old and was going strong. I cleaned it as I have done every 3 months since I built it. I took the gpu out and gave it a shot of compressed air as I noticed the temptetures had risen a bit. I put everything back together and no output to display. The pc still works as I plugged the motherboard output into the monitor and business as usual. Anyone got any ideas how to fix this?. If this doesn't work I may give my pc to my dad as I don't have money to fix it and I'm saving for collage.