CPU inexplicably overheats

[Rhianwen]

My sister purchased someone's retired gaming rig that came with this Gigabyte GA-X79-UD3 motherboard, it features insanely easy access to overclocking. She didn't touch anything on it, she hates the idea of overclocking and it worked fine for the entire eight months she owned it, I also made sure everything in the UEFI menu was on stock settings too.

 

However for some reason, right after a Windows 10 update, it starts randomly shutting off from overheat. I mean, the CPU temps will reach 82C really quick before hovering there for ten seconds and shutting off at 84C, I disconnected the hard drive and discovered that the issue is independent from the OS. So I assume something was touched that shouldn't have been, so I removed the CMOS battery and left it sitting for an hour to try and reset the mobo's settings, didn't work... Last thing I done, was attempting to underclock it and reduce the voltage in the UEFI before it began heat throttling on me and shutting off in a span of one minute at best. Sadly, I didn't succeed and everything I caught a glimpse of appeared to be on stock settings.

 

Sorry if I am too rambly, I am just trying to cover all extenuating circumstances to help give everybody a better understanding of this issue. I'm at my wits end and I also heavily prefer to not flash it if possible, it's way too risky and I don't wanna brick the motherboard. Here are the specs to the PC:

 

Intel i7-3770k for the CPU

Corsair TX750M power supply

Thermaltake Water 3.0 liquid cooling (the reason why I can get a minute at most out of it)

Gigabyte GA-X79-UD3 motherboard

16GB of DDR3 Corsair Vengeance

A lonely 3TB system drive

GeForce GTX 970 Afterburner GPU

[Skiiwee29]

if it shoots up instantly like that.. sounds like an issue with the water pump likely being dead. Verify you can feel vibrations and hear water moving through the pump. 

[Tanaz]

Are you sure your pump didn't just randomly die?

[AbydosOne]

3 minutes ago, Rhianwen said:

Thermaltake Water 3.0 liquid cooling (the reason why I can get a minute at most out of it)

Is the pump running?

[Rhianwen]

Hmm, I felt the hoses last night and they were still pretty darn cold, so that may be it... This is legit my very first time dealing with liquid cooling, so bear with me here lol

 

If the hoses and radiator were still very cool, while the block is blazing hot, that would be viable confirmation right?

[Rhianwen]

40 minutes ago, AbydosOne said:

Is the pump running?

I followed Skiiwee's advice just now, I removed the fan and listened closely, it gurgled for a split second then nothing happened, no vibrations nor sounds. I can safely say the pump is indeed dead.

 

I almost completely neglected something so simple as the liquid cooling being a factor, thank you so much everyone!

[Alan G]

Get a good air cooler now and you will get many thanks from your sister for fixing the PC!