something has gone horribly wrong

Just tried removing the y cable and plugging the fans straight into the motherboard it skipped the cpu fan error got to windows logo and switched off again
 
I left the stock thermal paste on I'll try changing that next nothing is blocking it I've unscrewd and reseated the heat sink already this morning.
 
Do these mount the same as a normal waterblock? Screw at each corner which goes into a backplate? Are you screwing down diagonally opposite screws (top left & bottom right, then top right & bottom left) equally a bit at a time until they are all of a similar tightness?

Another thing to try would be to take out the AIO and install the stock cooler just to see if everything works.
 
This sounds very much like Temperature Protection on the CPU.

If I were you, I would buy some thermal paste, remove the H100 and re-apply it with new paste and ensure it is seated correctly.

Also ensure the fans and profile are set correctly via the unit and the rad fans are spinning.

Then into bios and reset to default and start from there.
 
Make sure you've used the correct mounting posts/screws on the H100i they are different for Intel/AMD so it may not be making good contact/applying enough pressure.
 
Well after a long day of trying everything under the sun I decided I'd return the h100i and get a replacement to see if that was the issue and guess what it's working for now. Temps are reading between 32-38 on cpu when in bios is this mor normal than the 50 plus before? Also is there anything or programme I can use to see if it'll happen again or just play some battlefield and hope for the best? Thanks for all the help guys your amazing.
 
Sounds like it's now operating under normal parameters. Nice one, you got there in the end.

Was almost definitely like it was temperature protection kicking in. You're lucky. In the old days the cpu would simply have fried.
 
Your PSU won't be outputting 500w like stated, it'll be outputting around 400w (20% is lost to heat).

This is incorrect, the inefficiency is built in to the rating.

For example, a 500 W PSU will be rated to put out 500 W on the PC side, but will draw more from the wall, probably around about 500/0.8 = 625 W.

In other words, if the components themselves use 500 W, your PSU will supply that and generate 125 W of heat doing so.
 
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