Stumped by a mystery overheating problem

I have a system problem I'm stumped with. My system is overheating and shutting down. At first I thought it was the SSD drive because I was getting disk errors, but now the system won't get past post.

My system is a i7-9770k, 32gb ddr3 g.skill ram, OCZ SSD drive, Geforce video card and a Corsair h100i liquid cooler and Asus Republic of Gamers Maximus Gene V mobo.

I just cleaned the thermal paste off the radiator and processor and applied more Arctic Silver but after booting, if I just sit in BIOS and watch the temps, it starts at 30°C and steadily climbs to ~90°C and shuts down. I've turned off all mobo performance options and all overclocking but it made no difference.

Is this the cooler flaking out?

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Clarification Request
Is this the 4770K?

I see the stock i7-4770K has a bundled fan and heatsink (and thermal paste) so if you have such to test with, it's time to do that.

In the BIOS this should not happen so it points to board and/or CPU failure.

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Corsair h100i May Be Blocked or Pump Failing

I agree with R. Proffitt. Your water cooling may be failing even though the fans are working. Maybe the pump is not moving the fluid around as it should, and that would cause rapid overheating depending on how sluggish the pump action is. There's a slim possibility of a blockage in the tubes somewhere which would give a similar result.
Also, double-check whatever clamps down the cooler onto the cpu. If one clamp is just slightly "off" then heat would increase, obviously.

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If you find that R. Proffitt is in fact correct and that you have to replace your mobo, do yourself a favor and move away from ASUS and to Gigabyte. They have MUCH better products than ASUS ever has. ASUS also has LOUSY phone support! I can't address phone support at Gigabyte as I've never needed it and neither have my friends. I, along with several friends of mine have had way too many problems with ASUS products and their lousy phone support. I've had Gigabyte products in the past with NO complaints (one mobo was used for over a decade with daily use and it still works, just doesn't support newer than XP) so I changed back [to Gigabyte] and advised my family/friends to do the same. None of us who are using Gigabyte have had any problems at all. Check them out! Wink Happy

***DISCLAIMER: I am not and never have been employed by Gigabyte.
I am simply an extremely satisfied customer. My family/friends who opted for Gigabyte are also quite happy. I know this because I'm the one who works on their machines.

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(NT) I've stuck to Gigabyte since bad caps days.

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