no lights on mine will come on. mine was on did a update said it was restarting and then never would come back on after that.

Unplug it from wall power, remove the CMOS battery from the motherboard for about 10 seconds to reset the BIOS, plug it in and try turning it on again.

If you hit the power button and nothing at all happens, chances ae good you need a new power supply. A bad motherboard can cause that also although in most cases with a bad motherboard the computer will at least turn on and have fans spinning.