programs open slow, downloads fail, chrome crashes, youtube and popcorntime videos crash/distort

[martijnbove]

So im trying to fix a friend's pc (problems in title). Ive swapped out the ssd with mine(has all my working programs and software) and has the same problems, i swapped out the ram, videocard, reset the bios, swapped mobo. When opening fortnite launcher the cpu use goes up to 100% (80+% for the launcher alone, and the program basically crashes). Tried the timespy benchmark but it crashes halfway, altho stress testing the cpu doesnt crash the pc/program. Temps are fine (40-60 under load). Should i try swapping the cpu as well? I read somewhere that if the pc boots it cant be the cpu so i dont know if i should. Anyone with experience?

Components:
Gigabyte z97x gaming 5 (this is the swapped one, before i had an msi z97 gaming 5)
i5 4690k
msi gtx 970 gaming 4g
cooler master g650m
samsung 850 evo 120gb ssd
seagate barracuda 1tb hdd
cooler master 412s

Thanks in advance for anyone who takes the time.

 

[Kashimi]

I'd say it's the CPU if you've swapped out every single component as you describe.