What is a 4790h?
Is the cooler attached to the cpu proper?
Is the cooler working?......pump/fluid/exhaust fan.
90 degrees what, C or F?
Try a different temp prog or there might be a monitor in the bios.
Hi. Hope you can help
Specs
i7 4790h CPU
GTX1070 GPU
Hyper X fury 16gb ram
Corsair H100iV2 watercooler
Corsair HX750i PSU
Z975s sli Krait edition
NZXT h440 case
240 SSD + 2tb Hdd
Never been overclocked
My son and I built his PC last year and all was fine for 6 months, then my son told me the CPU was overheating when nothing was on.
From cold the CPU would register over 90degs via realtek within 2 minutes and the fans on full,
He was playing a GTA mod one night and the rest is history
We've removed and resealed the cooler with new paste but no joy. Cant use pc for more than a couple of minutes for fear of permanently damaging the cpu
any suggestions please

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic