Voltage selector switch is adjacent to power cord
connection. A red slide switch that reads either 110 or 220.
BTW, universal power supplies can be used anywhere in the
world because they electronically select this switch - don't
depend on humans. Universal supplies are standard in laptops,
camcorders, and digital cameras. Many CRT video monitors also
contain universal supplies.
Unfortunately some would respond to your question
erroneously; without first learning basic facts. Any
acceptable computer power supply can be shorted and must not
suffer damage. Every power supply output wire can be shorted
together and still damage must not result. Intel specs even
say how large this shorting wire must be.
So why would another suggest a motherboard shorted to
chassis would cause PSU failure - and RAM & CPU damage?
Things damaged because the computer assembler buys his power
supplies on hype and price rather than using good technical
numbers. Too many computer assemblers only know that if A
mates to B, then it must be so. They don't need know anything
more to be an expert. They buy power supplies missing
essential functions which is why they suffer RAM and CPU
failure. Then they blame anything but themselves - the
technically naive computer assembler - as reason for failure.
If motherboard shorted to chassis causes RAM, CPU, or power
supply failure, then reason for that failure is directly
traceable to the human who bought components. As BigH2K says:
If it was a decent quality PSU then all your components
should be fine, ...
Why the pop? Probably a manufacturing defect. Exactly why
a computer assembler has a 3.5 digit multimeter to verify in
but seconds where the problem is located. Procedures
demonstrated previously in "Computer doesnt start at all" in
alt.comp.hardware on 10 Jan 2004 at
http://tinyurl.com/2t69q or
"I think my power supply is dead" in alt.comp.hardware on 5
Feb 2004 at
http://tinyurl.com/yvbw9 .