does the fan spin? if it does go into bios and lower the limit at which it complains.
if it does not spin, then try moving the 4 pin one over, but it should only fit one way.
Huh? parents dont know that stuff and i never touched it. when i start it up none of the f buttons will be accessed and the escape button to get into the boot menu wont work. keep getting the cpu fan fail error
is this computer important/irreplaceable? if so i'd seriously consider finding someone with experience to resolve this issue for you rather than attempting it yourself after skimming over a dodgy guide or two.