This is strictly for Compact, for other makes see the link below. For you second question, I can't believe there is no reset. I've seen some that were so small, that you had to push it with the point of a pencil. Not that I don't believe you, because I've seen some weird thing done to computers. If you fit a new hard drive, it just automatically tells you you have a new hard drive and then keeps on loading windows.
Timing is everything.
This is strictly for Compact, for other makes see the link below. For you second question, I can't believe there is no reset. I've seen some that were so small, that you had to push it with the point of a pencil. Not that I don't believe you, because I've seen some weird thing done to computers.