I've been really unlucky these couple of days

Just yesterday, i opened my old comp, for the first time in 4 years

, to see whether I could install a harddrive in there, there was no space so I closed it. Next day when I try to turn it on, the harddrive spins up but the screen is blank. When I took it to a technician, he told me that the CPU had fried.
Fortunately all the data on the harddisk is still there but this means that I'll have to get a new 'old' second-hand comp....