Now the fun part begins.
Take the motherboard out of the case and test it. This is to check for an electric short caused by a dead insect or similar. Remember to check the underside! It will also allow you to check for blown components - capacitors especially.
Strip the motherboard down to just the CPU - no RAM, no GPU, no nothing else. Set it on a box - not an anti-static bag - and attach the PSU, your monitor, and make sure the piezo buzzer / speaker is plugged in. Then try powering on. If you get bleeps, that's good. (Google the beep codes.) If it doesn't then your CPU or motherboard is dead. Next add ONE stick of RAM and power on again. If that fails then try another stick of RAM. And so on. Keep adding or replacing stuff intil you get a failure. If all ther sticks of RAM fail, try plugging one in to another DIMM socket.
Take the motherboard out of the case and test it. This is to check for an electric short caused by a dead insect or similar. Remember to check the underside! It will also allow you to check for blown components - capacitors especially.
Strip the motherboard down to just the CPU - no RAM, no GPU, no nothing else. Set it on a box - not an anti-static bag - and attach the PSU, your monitor, and make sure the piezo buzzer / speaker is plugged in. Then try powering on. If you get bleeps, that's good. (Google the beep codes.) If it doesn't then your CPU or motherboard is dead. Next add ONE stick of RAM and power on again. If that fails then try another stick of RAM. And so on. Keep adding or replacing stuff intil you get a failure. If all ther sticks of RAM fail, try plugging one in to another DIMM socket.