system power problems

[bighirst]

Ok, so i had a motherboard (soyo sy-p4I865PE Plus) that i purchased a
while back, just had sitting around till i had some money to put
together some parts to build a comp.

I bought a celeron prescott 335 2.8 Ghz and a few other things (not
really too important).

all in all, i got the system hooked up, turned on the power....and
nothing. The fans spun, but the monitor stayed blank. No beeps from
the motherboard either. I checked cables, took out ram, unplugged the
hard-drive, still no beeping. I finally took out the motherboard, put
it on the anti-static pad to see if it was a grounding problem or
whatnot, just had the cpu in the motherboard, nothing else, still no
beeps.

so the question is, to my limited knowledge, i guess either the mobo
or the processor is faulty, but how do i know which to replace? is
there other help at all, or maybe there is somthing im missing...? any
comments would be appreciated

Dan

 

[v]

Did you move the jumper from 'clear cmos' to 'normal'. This may seem
like a silly question but, do you have a p4 power supply/

DRG

 

[Stephen]

Ok, so i had a motherboard (soyo sy-p4I865PE Plus) that i purchased a
while back, just had sitting around till i had some money to put
together some parts to build a comp.

I bought a celeron prescott 335 2.8 Ghz and a few other things (not
really too important).

all in all, i got the system hooked up, turned on the power....and
nothing. The fans spun, but the monitor stayed blank. No beeps from
the motherboard either. I checked cables, took out ram, unplugged the
hard-drive, still no beeping. I finally took out the motherboard, put
it on the anti-static pad to see if it was a grounding problem or
whatnot, just had the cpu in the motherboard, nothing else, still no
beeps.

so the question is, to my limited knowledge, i guess either the mobo
or the processor is faulty, but how do i know which to replace? is
there other help at all, or maybe there is somthing im missing...? any
comments would be appreciated

Dan

Are both motherboard power connectors connected?

Does the bios on the motherboard support the prescott?

Stephen


--

 

[Last Boy Scout]

Normally there is the standard 20 pin power connector to the motherboard
and also a 4 pin P4 Connector that also has to be plugged in to make it
work. The CPU fan needs to be plugged into the 3 pin CPU Plug on the
motherboard labeled CPU Fan. Then after that it should start. Make
sure the wires for the power supply are hooked up right. Then if it
still does not work the motherboard is probably grounding out. Often a
mounting post comes up in the wrong place or the motherboard is
contacting metal somewhere important. The CPU might also be mounted
incorrectly or the jumpers set wrong for the CPU type. Then try
resetting the BIOS with the BIOS Clear button.

Then you start taking it apart to bare bones and then out of the case.
Test it outside of the case on a piece of cardboard and see if it will
boot with just a screwdriver shorting the power button pins. One touch
and it should start up.

 

[bighirst]

Normally there is the standard 20 pin power connector to the
motherboard
and also a 4 pin P4 Connector that also has to be plugged in
to make it
work. The CPU fan needs to be plugged into the 3 pin CPU Plug
on the
motherboard labeled CPU Fan. Then after that it should start.
Make
sure the wires for the power supply are hooked up right. Then
if it
still does not work the motherboard is probably grounding out.
Often a
mounting post comes up in the wrong place or the motherboard
is
contacting metal somewhere important. The CPU might also be
mounted
incorrectly or the jumpers set wrong for the CPU type. Then
try
resetting the BIOS with the BIOS Clear button.

Then you start taking it apart to bare bones and then out of
the case.
Test it outside of the case on a piece of cardboard and see if
it will
boot with just a screwdriver shorting the power button pins.
One touch
and it should start up.

ok, a will try today when i get home from work. I have taken the mobo
out, the power cables were all connected right, just looks like there
are a few more options i can try before i decide if the mobo or cpu is
bad. Ill post a reply soon with and update

Dan

 

[Matt]

ok, a will try today when i get home from work. I have taken the mobo
out, the power cables were all connected right, just looks like there
are a few more options i can try before i decide if the mobo or cpu is
bad. Ill post a reply soon with and update

Dan

You seem to have complete confidence in your power supply. I'm sure
everyone would like to know the brand of a supply whose function is
beyond question. Everybody will want one.

 

[bighirst]

You seem to have complete confidence in your power supply.
I'm sure
everyone would like to know the brand of a supply whose
function is
beyond question. Everybody will want one.

my power supply is an Antec 350W. The thing is, I already hooked it
up to the system im running now and it booted, so I didnt figure it
would be a power supply failure if it worked on this system.

By the way, I took out my mobo, put it on cardboard, only hooked up
the cpu, did the screwdriver trick to turn it on, still a no go.
Another interesting problem that cropped up for the second time.....
After a few tries of starting it up changing the clear cmos setting,
when i flipped the power supply switch to turn it on in the back, the
red LED came on near the cpu, and when i powered it up, no fans came
on, nothing happened, just the led turned off. I tried it multiply
times with the same effect.

this happened a few days ago too, I switched my power cord and the
problem went away, which i believe was just a fluke that it changed
the problem. Both of my power cords work perfectly with my current
computer.

So how is that for some more information?

Dan

 

[Matt]

Dan

Get it down to psu, mobo, cpu, ram, keyboard, and video. Check voltages
with a multimeter. Then start swapping stuff---easiest things first.

 

[bighirst]

Get it down to psu, mobo, cpu, ram, keyboard, and video.
Check voltages
with a multimeter. Then start swapping stuff---easiest things
first.

umm...where do i get a multimeter, and how much does it cost (im just
a poor college student) hehe

Dan

 

[kony]

umm...where do i get a multimeter, and how much does it cost (im just
a poor college student) hehe

Dan

Just about anywhere... Superstores, hardware stores,
electronics stores (like Radio Shack), online stores, eBay,
etc, etc. Cost depends largely on quality, features, and
brand name. Typical price range is $5 to $300 for hand-held
models. Accurancy is less likely in low-end models as they
may not be (or at least not properly) calibrated at the
factory and they may drift (go out of calibration faster) as
they age.

If you want a suggestion, check eBay occasionally for a
Sears 81437. That particular model (none of the other
Sear's brand meters though) is a relabed Fluke meter without
buttons for a few functions unnecessary in PC
troubleshooting. Of course you might find it at Sears
stores too, $50 IIRC, but usually half that on eBay. The
Fluke version sells for around $120 (though is rare in the
US compared to other Fluke models).

here's one,
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=25412&item=7527320501

The following is about the cheapest I'd suggest. You can
get $5, $10 meters but they're small (to tiny to easily use
or see at a distance), more fragile, probably less accurate
and often don't even take comon (lower cost) batteries. A
multimeter is a tool even a casual user may find need for,
for years to come. Better to spend an extra $10 IMO, if not
more. I'm not suggesting a $20 meter is great but even when
you get-what-you-pay-for, there's still a certain minimum
necessary to get above bottom-of-the-barrel quality..

http://www.allelectronics.com/cgi-bin/category.cgi?category=760&item=DMM-35&type=store


http://www.itcelectronics.com/pdtl.asp?P=1628
http://store.yahoo.com/webtronics/dimuc.html

 

[Matt]

umm...where do i get a multimeter, and how much does it cost (im just
a poor college student) hehe

For less than $10, you can get one that is about as good as the ones
people bought for $500 twenty years ago. Digital multimeter. Farm
store, Walmart, hardware store, auto parts store, etc. If you know an
electrical engineering student, you may be able to borrow a meter.
Maybe you can borrow the student along with the meter.

See also pp. 10 and 29 of:
http://64.233.167.104/search?q=cach...f+"voltage+specifications"+atx+standard&hl=en
http://www.formfactors.org/developer\specs\ATX12V_1_3dg.pdf

 

[Ed Medlin]

my power supply is an Antec 350W. The thing is, I already hooked it
up to the system im running now and it booted, so I didnt figure it
would be a power supply failure if it worked on this system.

PSUs are funky sometimes. I have seen them boot one system and not another.

By the way, I took out my mobo, put it on cardboard, only hooked up
the cpu, did the screwdriver trick to turn it on, still a no go.
Another interesting problem that cropped up for the second time.....
After a few tries of starting it up changing the clear cmos setting,
when i flipped the power supply switch to turn it on in the back, the
red LED came on near the cpu, and when i powered it up, no fans came
on, nothing happened, just the led turned off. I tried it multiply
times with the same effect.

This symptom is very typical of a problem with your PSU. This is something
you must verify. Whenever I get problems like this, the first thing I do is
try another PSU. Antec makes good power supplies, but no brand is
bulletproof.

Ed