If one day you go to turn on your computer from a "cold" state, and it won't power up, check the USB ports. Sometimes fans and some lights will come on but the machine just won't go further and power up. It can be frustrating, I know.
Check the USB ports. If you have something powered plugged into a USB port (ie, an external harddrive), some machines seem to believe they are already on because they are getting power through the USB port.
If you have nothing plugged into any USB ports, check the ports themselves visually. Sometimes a bent pin or wire can be shorting something. Sometimes people don't allow a USB plug to go in properly and jam it in the wrong way. That can mess things up.
So if after having checked all the USB ports on your desktop or laptop and nothing is damaged or plugged into them, check how much dust is in your power supply or exhaust fan. If there's a lot of dust, you might want to start thinking about purchasing a new machine, and then get this one cleaned out. You will probably need a new power supply.
If you're still not sure, have a professional have a look to troubleshoot your issue.
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