Desktop won't start up?

I recently built a custom ptc and it worked PERFECTLY for about a few hours! I had windows running, I had had everything running smoothe! Until all of the sudden it stopped working. I can still power on my computer and ill see the LED lights and the fans moving. The power supply is more than enough to handle all... show more I recently built a custom ptc and it worked PERFECTLY for about a few hours! I had windows running, I had had everything running smoothe! Until all of the sudden it stopped working. I can still power on my computer and ill see the LED lights and the fans moving. The power supply is more than enough to handle all the parts and theres fairly good ventilation! All the parts are compatible so thats not ghe issue it just wont Go into the bios or anything else. Here's a list of what I checked

I tried another hard drive
Re-did the case wiring
Checked the RAM

The hard drive (Others didn't work either
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