mobo / cpu troubleshooting

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hello all,

my question regards testing if a cpu and mobo are functional.

Functional:
Power Supply
RAM

Items in question:
2.5ghz Celeron
Mobo (from eMachines compter)

When the PS is connected to the MOBO, the LED on the front of the
computer (indicating power) is lit. When power switch is pressed (to
boot computer) nothing happens. Fans do no spin, ect.

Failed repair attempts:
1. Switched the power switch
2. Put CPU into an old P4 compatable board running a 1.8ghz P4 with
512MB pc133 RAM. Computer boots, but hangs. No video signal. Perhaps
FSB / RAM is incompatible?

CPU shows no signs of visible damage. I am unaware of how the PC
reached this current state. Best guess is some type of power surge, as
i had to replace the PS.

Are my MOBO, CPU, or both fried?

any information you can provide is greatly appreciated.

thanks,
aaron


mobo / cpu troubleshooting

hello all,

my question regards testing if a cpu and mobo are functional.

Functional:
Power Supply
RAM

Items in question:
2.5ghz Celeron
Mobo (from eMachines compter)

When the PS is connected to the MOBO, the LED on the front of the
computer (indicating power) is lit. When power switch is pressed (to
boot computer) nothing happens. Fans do no spin, ect.

Failed repair attempts:
1. Switched the power switch
2. Put CPU into an old P4 compatable board running a 1.8ghz P4 with
512MB pc133 RAM. Computer boots, but hangs. No video signal. Perhaps
FSB / RAM is incompatible?

CPU shows no signs of visible damage. I am unaware of how the PC
reached this current state. Best guess is some type of power surge, as
i had to replace the PS.

Are my MOBO, CPU, or both fried?

any information you can provide is greatly appreciated.

thanks,
aaron


Re: mobo / cpu troubleshooting

It's doubtful that they are fried, and the CPU test you used would
probably fail due to the fact that your old pentium 4 board was not
intended for a celeron processor so yes FSB n stuff would be off...i
would tend to think the mainboard's fried because it failed to even
turn on the rails in the power supply (no PWR_GOOD Signal), I would
suggest testing your power supply from the celeron system in another
ATX machine WITHOUT the celeron in it (use known working CPU), if the
supply still works then it's probably your board...your CPU (the
celeron) should still be OK


Re: mobo / cpu troubleshooting

Thank you, my thoughts exactly (More info needed)


Re: mobo / cpu troubleshooting

aaron.colon@gmail.com wrote

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Best check for that is to connect the two pins used for the
power switch with a screwdriver at the header, carefully.

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Or that older motherboard wont accept that particular cpu.

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The other obvious possibility is that the original PS died and
killed the motherboard in the process. Thats not uncommon.

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Its not common to kill a cpu, its much more likely to be the motherboard.

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Check for bad caps on the motherboard. These are the usually blue or black
plastic covered post like things that stick up vertically from the motherboard.
The tops should be flat. If any have bulged or have leaked, the motherboard
is dead.



Re: mobo / cpu troubleshooting


aaron.colon@gmail.com wrote:
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Your motherboard is dead, but the one last thing you can try is to put
the p4 1.8 in the motherboard and see if it'll boot (it probably won't,
but it won't hurt the chip) . It's suffering the typical black and
silver emachines death of simulltaneous motherboard and PSU failure.
I've seen more than a dozen of these. The CPU, hard drive, RAM, and
optical drives are still fine, probably. It's nothing you or the
previous owner did to kill it, it's just emachines.

A standard mATX motherboard will fit in that case.


Re: mobo / cpu troubleshooting

thanks for all the information.

i will probably buy another Mobo.

thanks again,
aaron


Re: mobo / cpu troubleshooting


I have two P4 boards that have both stopped there video or normal boot
the fans spin and the system physically tries to go through the start
process but no video conformation the video card and on board video are
good and the power supply has been changed and re-changed the CPUs have
been changed with the same results. I also had a friend that ran into a
similar problem and after unplugging the board for a couple days it
worked any Idea what would cause this kind a problem and Other Ideas on
how to fix it?


Re: mobo / cpu troubleshooting


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To get help here, try this:

1) Give a complete hardware inventory. That is important, because
   sometimes the poster has an oddball hardware device that is
   causing all the problems. Don't forget to mention that USB
   card reader, for example.

2) Give a complete symptom description. What tests have you already
   carried out ? What things did you see or hear when using the
   computer ? Was there a funny burnt smell ? Was there a recent
   lightning storm ? You'd be surprised some times, how many
   questions we have to ask people, until they give the info
   needed.

There are whole books written about computer repair. If you ask
a one line question, we'd have to write you a whole chapter in
return. If you give a complete description, we might guess the
answer for you on the very first try.

Many things can completely kill a computer. So we need a lot of
info to narrow things down.

HTH,
     Paul

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