OK, if you cant get into the PC then that is the problem, nothing to do with the internet.
It's not definite as difficult to diagnose from the info I have but it seems that the OS is not able to start. This can be a number of things ranging from the BIOS, hard disk or processor failure. Quite often its simply a disk segment failure but then if it fails in the OS code you may need to load repair disks. Did you create a start-up USB or disk to try?
To be honest getting a ten year old computer repaired (if you cannot do it yourself) is throwing good money after bad. You would be better off buying a new one.