Compaq Presario 2100 wont start

Think I'd make a bee line for the ol' PSU, power supply unit.... could
be wrong of course but seems about logical. It would be fine if you
borrow one to try, the Wattage or power rating needs to be equal to or
greater than the one that is in.

Check the mobo power connector as well, sometime's the pins or the
wire crimps become loose.... ya can imagine loose connections passing
a resistive connection, things start to get warm and discolour as well
as a voltage drop.

The fans work from the 12 volt rail from the power unit, careful if
you should go prodding about with test meter probe's... busy with my
head in a telly and the guy on the next bench just built a brand new
computer up, there was an almighty bang and blinding flash...

....not only did he short the 20 amp rail out he blew the whole lot
and cpu, blew a screwdriver into bit's..... "and cured mi
constipation... ".

Doubt it could be the bios battery but you never know, think it
should'nt stop the fans spinning though. These coin cells last at
least three years so if it's around this age 'may' be tempted to
change it myself, note: removing this
for more than about two minutes will cause the bios to default and
you'll have to go to bios screen and do a re set... so leave this as a
last resort.

It may well be the fans are clogged with dust, they should spin easily
when flicked by a finger otherwise no rotation means no 12 V or no
'power good' signal, which would indicate mobo or CPU.

Davy

Davy,

I tried the new power pac to no avail. I didn't try the tiny battery
inside yet though.

It has a good green light when it's plugged in and the battery is
inserted but the power button light, when pushed in to start , goes
out in a matter of 2 seconds. I see a few other lights that light up
for a second only to go out also. Nothing comes on as far as the fan
or hard drive or screen so maybe there is something else screwed up?

I haven't opened it up either so maybe thats something I may have to
do.

Thanks buddy,

Steve

Might well be worth trying the back up battery, sometimes the bios
chip can get corrupted... obviously something is preventing the 'power
on' signal.

Obviously the bios would set to it's default setting, would do anyway
if the battery 'is' dud.

I would have suggested, removing the graphic card then giviing it a
try... and then same with the RAM, because without these you would get
a series of bleeps if the mobo was ok but don't know the configuration
of the 2100.

Wonder if the inverter for the backlights could be disconnected...
just to see if you get the fans to spin, this is usually a tiny
plug-in modual, the only other thing I can think of is the CPU or a
faulty mobo.... do hope I am wrong.

http://www.daniweb.com/techtalkforums/thread15861.html (I did'nt post
this here did I???? :evil: )

Davy

Davy,

I just got home from work and found your reply. I will
have to dig into this thing and see what I find. I'll try the battery

and check for anything loose.

I can't thank you enough for all the guidance you have given me
along the way.

I'll keep you updated as I go along.

Thanks again Davy,

Steve