Need help with this pc it wont even turn on now

so My friend is currently having an issue with their pc they woke up this morning and when they tried to login to their pc and they press enter to login their pc starts to reboot or turn off and on over and over and it continues to do this till they turn the power supply off. they decided to clean their pc and reapply thermo paste also while they were at it and when they plugged everything back in it still did the same thing they checked to see if they plugged everything in the correct spots and now it wont even turn on now. any ideas why?

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