I tried to reconnect all wires but still the same problem just a blue/black screen and it says ”No signal” on the screenIf you vacuumed it, I would say there's a good chance that some wires got knocked loose. Make sure all wires are well connected to the motherboard and to the drives, and GPU if you have one, and all wires attached to the PSU are secure. I've had similar happen to me before.