I have mixed feelings about this thread. On one hand, it's pretty cool that modern PCs have become so stable, we don't immediately reach for the power cord as a troubleshooting measure. On the other hand, things do lock up sometimes, so if you're asking for help and have NOT yet tried the power cord, then you haven't eliminated the obvious stuff yet.
"Hello, IT, have you turned it off and back on again?"
Main System: i7-8700K, ASUS ROG STRIX Z370-E, 16 GB DDR4 3200 RAM, MSI GTX 1080 TI, 1 TB CRUCIAL MX500, Corsair 550D
HTPC: I5-4460, ASUS H97M-E, 8 GB RAM, GTX 970, CRUCIAL 256GB MX100, SILVERSTONE GD09B