|In addition to the above post. It's possibly your graphics chipset, motherboard, RAM or even something obscure like a faulty wifi card. So put your detective hat on. |
Start with the basics and unplug the power cable from the tower and then press and hold the power button for 30 secs,. Next step is to clear CMOS completely by either moving the dipper from one side of the 3 pin array to the other side and then back again or just take the battery out for 5 minutes. if this doesn't work then try swapping out the RAM or reseating the processor and changing the thermal grease. If it still doesn't boot then try a graphics chip reflow, but carefully, don't go setting fire to the motherboard and make sure you get some liquid flux under the chip. Then if your still having problems, well it's probably going to mean spending some money. Either new PSU, MOBO or processor, you'll need an electrical meter to test your psu, cable and MOBO first and if none of those are at fault look at replacing the processor or buying a new PC.