Sounds most likely to be the power supply, as Damon and
Erik have suggested.  Here's some added thoughts/suggestions:

- I'm assuming that when you hit the power button, there is
absolutely no effect?

- Power supplies (PS's) can go flaky or die fairly regularly,
in my experience.  If you buy a replacement, don't cheap out
and buy a cheesy no-name brand PS.  If it's a fairly high-end
system, I'd recommend getting a 400W PS - good ones will
probably run you $70 or more.

- On most modern PC's, the motherboard (MB) governs
turning on the power supply, so a dead motherboard could
possibly look like a bad PS.  Unfortunately, this makes it
tricky to directly test the power supply

- After trying Erik's idea to reseat all the power plugs, if that
doesn't help, try unplugging all the power connectors to the
drives and case fans and stuff, except for the power to the MB.
This will help eliminate the fans/drives/etc from the list of
potential causes.  NB: don't unplug the heatsink fan on the
processor!  Also, try unplugging all the PCI boards in your
system - even the video card.  You can't boot like that, but
you'll be able to tell if the power comes on or not.  Afterwards,
make sure you reseat all the PCI cards securely.

- By connecting the right pins on the power cable to the MB,
you  can power up a PS without needing the MB (which would
eliminate that possibility of a bad MB), but it's probably not
worth the effort.

- It's not that hard to remove a PS from the case.  If the PS in
your old PC isn't too much less wattage than the "dead" PS,
you can connect your old PS to the new PC and see if you can
then power up.  (You wouldn't even need to remove the dead PS
from the case to do this).  This would be the easiest, most direct
means of verifying that your PS is in fact dead.

- From what I've read, surge protectors over time gradually
lose their ability to protect (at least some types do)   (Sorry I
don't remember the exact details (but can probably do some
digging if you want)).  Anyway, if your surge prot is very old,
it might be worth replacing.

good luck!
-bryon


"J.D. Giorgis" wrote:

> This morning, I turned on my computer to check my
> e-mail.   I was simply sitting, typing away, when my
> computer mysteriously powered down.
>
> Upon inspection, I noticed (ack!) that a side panel to
> the computer case had come a bit loose.
> Additionally, my friend noted that the back of the
> computer was unusually warm (which is odd, since I
> bought an extra fan for the case - as I knew I would
> leave it on a lot in a non-air-conditioned apartment.)
>
>
> At this point I went to work, but when I came home,
> the computer still will simply not turn on.   I
> plugged in my old computer using the same cord to the
> same surge protector and same plug - and clearly, my
> old computer is working just fine from that plug.
>
> So, any ideas as to what happened and how it could be
> corrected?

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