When I press power button light is yellow and will not turn green to start up windows.

Can power switch be fixed or replaced ?

Where can I find diagram of inside computer because if I need to dispose it I what to remove hard disk because it contains personal information.

jamesbabej, March 2013

The fault is more likely the Power Supply than the switch.

To get to the hard drive - remove the side panel (couple of screws) and find the disk at the front of the machine - easy to remove - Power Cable - Data cable - couple of screws.

Smash it with a hammer.

Peccavi, March 2013