I've been having an issue that started today with my desktop, I'm really stumped and can't find the issue. My desktop shuts itself off thirty minutes after start up, I've been running a stop watch and it happens like clock work. I'm pretty positive it's not my hardware, but just to be sure I tore down my computer, re-seated the cpu cooler, and checked for loose connections. My temperatures are all normal sitting at just below 38 degrees Celsius and I've been monitoring them before it shuts down. So I'm guessing this is software related, I've ran MalwareBytes and Avast scans and nothing suspicious. I also used CCleaner. Any suggestions on what I should look for?