5 fixes when your PC randomly won’t turn on
https://www.pcgamer.com/5-fixes-when-your-pc-randomly-wont-turn-on/
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We already covered some of the common reasons why a newly assembled PC might not boot, such as plugging in the front panel connectors (and specifically the power switch) incorrectly and missing motherboard standoffs. If you’re having an issue with a new build, you should definitely check that out. However, it’s not always brand new PCs that can be problematic.