From someone who used to work in a computer store... 

One day we had a gentleman call in with a smoking power supply. The service
rep was having a bit of trouble convincing the guy that he had a hardware
problem. 

Service Rep: Sir, something has burned within your power supply. 

Customer: I bet there is some command I can put onto the AUTOEXEC.BAT that
would take care of this. 

Service Rep: There is nothing software can do to help you with this
problem. 

Customer: I know there is something I can put in... some command ...maybe
it should go into the CONFIG.SYS. 

[After a few minutes of going round and round] 

Service Rep: Ok, I am not supposed to tell anyone this, but there is a
hidden command in some versions of DOS that you can use. I want you to edit
your AUTOEXEC.BAT and add the last line as C:\DOS\NOSMOKE andreboot your
computer. 

[Customer does this] 

Customer: It's still smoking. 

Service Rep: I guess you'll need to call Microsoft and ask them for a patch
for the NOSMOKE.EXE. 

[The customer then hung up. We thought that we had heard the last of this
guy, but NO ... he calls back four hours later] 

Service Rep: Hello sir, how is your computer? 

Customer: I called Microsoft and they said that my power supply is
incompatible with their NOSMOKE.EXE and that I need to get a new one. I was
wondering when I can have that done, and how much it will cost.