You know you’ve got a serious PC problem when your computer refuses to get through even the first phase of startup properly. If you can't get into Windows or macOS at all, then your troubleshooting ...

How to clear your Mac cache (and stop the occasional crashes for good) ...

Corruption is bad in any walk of life, but you certainly don't want it in your computer. Yet when your apps aren't working correctly, or Windows seems to just crash ...