Urgent help needed_P4P800 SE only standyby power light _can't get Bios

  • Thread starter Thread starter Randy_O
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Randy_O

I've just built my sister a new P4P800 SE with a new 3E GHz Pent 4 CPU. I
use the packaged Intel fan and heat exchanger with the gummy heat exchange
compound. The system got too hot ( 78.5 degrees C or 178 degrees F almost
twice my own temps on my computer-- I get 100 degrees F), but ****I did get
a Bios**---- never got to the point of formatting and setting up Win XP. I
took the board out, and cleaned up the chip and the heat exchanger; then, I
applied good heat exchange paste I've used before. I set the computer
backup just like it was before. One ATA hard drive, a generic CD ROM, a
floppy, and a AGP video board ( simple setup). I checked and rechecked the
cords and plugs. The fans don't turn -- there is no action -- damn. All I
get is the green standyby power light inside the case when I turn the
computer on. Anyone have any ideas what I might try next? Thanks for any
help!

Sincerely --- Randy O
 
Randy_O said:
I've just built my sister a new P4P800 SE with a new 3E GHz Pent 4 CPU. I
use the packaged Intel fan and heat exchanger with the gummy heat exchange
compound. The system got too hot ( 78.5 degrees C or 178 degrees F
almost twice my own temps on my computer-- I get 100 degrees F), but ****I
did get a Bios**---- never got to the point of formatting and setting up
Win XP.
Click to expand...

Sounds like the heatsink wasn't on properly.
Have you tried the BIOS recovery methods, cleared the CMOS etc...?
Disconnect everything except 1 DIMM, and VGA card.
Do you use a static strap, or earth yourself properly before you pulled the
PC apart again?

If the fans don't turn try another PSU, or swap components into another PC
to test them.

Is the CPU fan connected to the right header on the motherboard?
 
"Randy_O" said:
I've just built my sister a new P4P800 SE with a new 3E GHz Pent 4 CPU. I
use the packaged Intel fan and heat exchanger with the gummy heat exchange
compound. The system got too hot ( 78.5 degrees C or 178 degrees F almost
twice my own temps on my computer-- I get 100 degrees F), but ****I did get
a Bios**---- never got to the point of formatting and setting up Win XP. I
took the board out, and cleaned up the chip and the heat exchanger; then, I
applied good heat exchange paste I've used before. I set the computer
backup just like it was before. One ATA hard drive, a generic CD ROM, a
floppy, and a AGP video board ( simple setup). I checked and rechecked the
cords and plugs. The fans don't turn -- there is no action -- damn. All I
get is the green standyby power light inside the case when I turn the
computer on. Anyone have any ideas what I might try next? Thanks for any
help!

Sincerely --- Randy O
Click to expand...

Power switch wires plugged onto the right pins on the PANEL
header ?

You are protected on the overheat thing. The processor has an
internal throttle, that should cut in around 70C. The processing
rate is reduced, by the processor not using every clock cycle.
A second level of protection occurs at 135C, where the processor
sends a signal called thermtrip, and that should shut down the board.
So I doubt this is overheat damage.

If you suspect the power switch on the computer case is bad,
you can substitute the reset switch to take its place. Just
connect the reset wires to the two power switch pins and try
that.

In fact, you don't need anything connected to the PANEl header
when running the board. If you have a screwdriver, drain the
static off the tip with your finger, and touch the tip to the
two pins on the PANEL header, where normally you would connect
the power switch. Only a momentary contact is needed to start
the board. Contact for 4 seconds or longer, may be required to
shut down the board via those two pins.

You can also test the motherboard outside the computer case.
That is just in case the motherboard is shorting to something.
You can start with the absolute minimum, just a motherboard and
the power supply. You should be able to turn on and off the
board, via the two power switch pins on the PANEL header.
If that much works, then try putting the motherboard and PSU
back in the case, being careful to only have standoffs where
there are mating holes in the motherboard. The standoffs should
be carefully aligned to line up with the center of each hole.
That reduces the risk of a standoff touching a copper track or
any components that they shouldn't be touching.

HTH,
Paul
 
Paul's advice on the Panel header switch wires was the ticket! It was too
damn late when I was still working on my sisters computer. I had the Power
Switch plugged in the wrong position, and other wires were also plugged in
the panel wrong because of this. I was so tired I never thought about that
area of the board being the problem. Anyway the cpu and heat exchanger were
cleaned up, and I put on some good heat exchange paste I've used in the
past; I only got a 8.5 degree C cooling. It is now 70 degrees C; it was
78.5 C. I believe its the P4P800 SE board I have; it's a weird defective MB
in this cpu temp respect ( I hope). My P4P800 DLX uses the same paste and I
get a temp of 38 degrees C. There's a light load on the SE MB too, and it
has two 120 mm fans. Any thoughts are welcome. I thank you both for advice
and knowledge. Paul has always been a big help at this newsgroup. Thanks
again-----

Sincerely ---- Randy O.
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