How is everyone doing.....

The problem that i came across while i tried to service a friends computer that went down on the day of block out..Was!!..The pc would not start, so the first thing that i did was check the power supply with one that was working, so my first move was right, the power supply was not working, after that was fixed i tried to boot up the operating system, but it would not boot up so i inserted my win 98 startup disk to see if i would be able to use "chckdsk" to see the integrity of the drive, but just as tried to insert the command i realized that the keyboard was not working nothing i typed was showing so i switch the keyboard for one that was working, but i experienced the same problem.......And now i'm stuck not knowing what to do can anyone help...........

Taiwl