4 pin 12v atx power supply connected the wrong way...

On 31 Mar 2004 16:00:16 -0800, (Mike Henley) wrote:


Okay... i've been to the store, i got some 5a fuses... so here's the
story... i replaced the fuse in the good PSU's power cable (mains to
PSU) and it worked... the computer is running fine, i downloaded video
from a cam, installed apps, everything is more or less running just
fine with no problem...

This still makes no sense... your (AC wall outlet to power supply) cords
have fuses? I've seen cords with fuses, but never for a PC power supply.

then that PSU that was connected when i had the accident (the
firecracker sound)... well, i replaced the fuse in its cable (mains to
PSU cable)... and it didn't run... maybe the firecracker sound came
from the PSU after all... i don't know... but that PSU isn't working
now... it was a high-end 550w PSU... i'm sorry it blew up 'cos it was
pricey but i'm sorta glad it sacrificed itself...

What brand was the 550W?
If you leave it disconnected from AC for a few minutes and open it, you
may see the damage. If a cap blew up you might see some paper-like foil
loose in the casing, if the damaged cap isn't intact enough to be
identifiable.

i find it strange that you say a normal cable doesn't have a fuse...
'cos i have those two PSUs and 3 cables... i can't remember which is
which... two of them are 5amp-fused, one is not... as mentioned above
about two fused ones, in addition, the unfused one gave me a nasty
spark when i plugged it in so i gave up on it... i was lucky that it
was the faulty psu that was connected rather than the good one when
that happened... so, i decided i won't be using the unfused cable
again.

There might have been something wrong with the power supply to begin with,
it shouldn't be drawing more than a fraction of an amp before the system
is powered on.