Becareful with UPS's though. I just bought on a few days ago. It says
it'll last 19 minutes, but that is only with an IMac with a 15" LCD screen.
My computer, a high-end power sucker, with a 19" CRT monitor, will only get
less than 2 minutes of power. As well, I am returning it to the store,
since, if my computer is in standby and the power goes out, the computer
will wake up, and then hibernate. This sudden requirement for power will
trip the circuit breaker for my UPS, since it thinks there is a power surge.
I'm not sure about all UPS's, because mine was the APC Back-UPS EZ 350, and
only cost $75.00 CND. In short, an 'eco-UPS'

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Change the obvious to the obvious.
------------------
Hi
Any outage when a PC is turned on can be disastrous - best to invest in an
UPS - that way you will have time to save any data files that you are
working and be able to shut the PC down properly.
If you in the middle of an install, with XP, the install 'should' pick up
where it left off - but that can't guaranteed - a piece of hardware could
have been fried by then. With a format, again you 'should' be able to pick
up... unless the HD is fried...
Will