motherboard beeps like ambulance (mehr compliziertes Problem) - Hilfe appreciated!

28/06/2010 - 09:25 von bj | Report spam

I had my PC repaired recently; the guy who came replaced the motherboard and
the graphics card. Afterwards, I found that he had put in a weaker processor
(AMD Athlon 2000) than I had had before (2200), so I wanted to replace that.
I detached the processor fan and replaced the processor.

Now, when I turn the PC on, for half a second a green diod lights up and the
fans go on, then the motherboards starts emitting pulse beeps like an
ambulance siren (eeeeooooeeeeooooeeeeoooo...) and everything (but the beeps
and the red diod) stops. Does anyone have an idea what the problem may be,
please? This persists also when I switch back to the old processor.

I had checked forums and found that this signal is typically emitted when
the processor temperature is too high. The old one that I removed had some
old paste on it, but the new one does not heat up in the half-second when
the PC seems to be working.
I plugged in the CPU fan and radiator (only did not click it on yet as it's
rather difficult, it requiring detaching the whole motherboard, but this
should not matter, should it?);
I switched the CMOS (?) jumper back and forth and even removed the battery
for 1 minute;
I removed and put the memory back in, checking the connections;
No capacitor seems to be swollen;
Apart from replacing the processor I didn't seem to be do anything.

Motherboard: Abit HF7; processor: AMD Athlon 2200

Could anyone suggest a solution, please? I have no more money for another
repair, and this is rather exasperating...
Vielen Dank im Voraus!


Lesen sie die antworten

#1 Ansgar Strickerschmidt
28/06/2010 - 10:12 | Warnen spam
Also schrieb bj:


Willst Du lieber Deutsch oder Englisch lesen? Entscheide Dich...

Well, I'll try in English first.
Typically, the "siren" sound is given when the speed of the fan is
regarded too low (or CPU fan is absent).
Has the service guy not only withdrawn your CPU, but possibly also changed
the CPU fan against an incompatible model?
Some BIOSes disagree with the CPU fans about the fan speed; be it that the
fan produces too many or too few pulses per turn. So I'd try
a) to dismount the CPU once again, very carefully (take care of ESD
measures; discharge yourself on a grounded conducting element such as a
water pipe, a heating radiator, or a grounded metallic case of another
electric device). Make sure you have a bit of thermal compound (yes, the
goo between processor and heatsink) at hand before re-mounting. Open the
socket, take the processor out (again, take care of ESD measures, see
above...) and check for bent or broken pins. Also check the processor's
die (the small rectangle in the middle) for cracks or broken edges. If you
need some examples for defective Athlon CPUs, see here: .
All edges of the processor's die must be straight and sharp. If only a
small piece is broken off, the processor is dead.
If everything seems OK, clean the processor thoroughly with alcohol
(Iso-Prop or ethanol), re-insert the processor carefully, spread a SMALL
amount of thermal compound THIN on the processor's die ONLY (the small
rectangle in the middle, you know...)! Then also clean the bottom of the
heatsink, and put it in place again VERY CAREFULLY. Watch for the correct
orientation - normal heatsinks have a "grade" (osr "step") along one edge
of their bottom; this must point towards the "thick" edge of the CPU
socket. Take care not to slip off the heatsink's mounting bracket with the
screwdriver during fixing the heatsink - damage to the mainboard will be
inevitable then.
It should not be necessary to dismount the whole mainboard, in order to
plug the CPU fan on. there should be a 3-pin header quite easily
accessible somewhere close to the CPU. Maybe you took the "Case Fan"
(System Fan?) connector. That wouldn't harm, but your mainboard expects a
correct speed signal from the *CPU* fan, obviously, so make sure to use
the correct header.

b) If everything above fits like it should, find yourself a different CPU
fan (even if borrowed only) and connect it to the CPU fan header. Note you
need not dismount anything again; just plug it instead of your original
one on the CPU fan header, to cross-check if the speed signal from your
CPU fan is the problem.

c) Jump in the face of your service guy who has damaged your system
without asking you, and obviously without proper testing. You're entitled
for either refund or having the fault repaired at no additional cost, in
any case.


*** Musik! ***

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