keannu leaves

I can't see how I would've broken the parts seeing how as I said it will boot every now and then.

Hey Guys, I got a second hand computer from my poppy 5 days ago and ive run into a few issues. As soon as I got the computer it worked fine, but when I moved all the components to my new case (swapped out the gpu, and i took out the ram and put it back in again (dunno why)) it started to act up, twice the computer worked fine and I wasnt interrupted but now the computer wont turn on, it either would boot to the login screen or just not boot at all. How can I fix this? I have tried the following; -Changed the powersupply -Reapplied thermal paste -Unplugged then replugged the psu cables Current Specs- (I've included literally included every spec trying to be as vivid as possible) OS- 64 bit Windows 10 home (not installed) CPU- i7-6700 Mobo- MSI B150M Bazooka GPU- 1070 founders edition PSU- thermaltake litepower 750 watt RAM- 4xGeIL 4GB PC4-17000 HDD- 2x 1TB seagate baracuda (both of them are wiped, i believe one of them had windows on it - can't confirm) CPU Cooler- stock intel cooler Case fans- stock thermaltake fans Case- Thermaltake view 27 Thank You if you can help, if you need anymore information please let me know and I will reply ASAP