Mobo or worse

  • Thread starter Thread starter Simon
  • Start date Start date
S

Simon

Hi,
got a customer dell here (dimension 4700) I'm pretty sure it's the mobo
on the way out. Symptoms:
Powered on it will either work ok until it gets halfway through booting
then freezes. Diagnostic leds are all green.
Other times powered on no leds show at all, processor fan runs flat out
and thats about all.
I've tried another psu and memory and tried the onboard graphics rather
than the pci express card (was removed for that test)

Any other ideas welcome :)
thanks.
 
Simon said:
Hi,
got a customer dell here (dimension 4700) I'm pretty sure it's the mobo
on the way out. Symptoms:
Powered on it will either work ok until it gets halfway through booting
then freezes. Diagnostic leds are all green.
Other times powered on no leds show at all, processor fan runs flat out
and thats about all.
I've tried another psu and memory and tried the onboard graphics rather
than the pci express card (was removed for that test)

Any other ideas welcome :)
thanks.
Click to expand...


Try unplugging all but the video card.

Also... disconnect the HD
 
Thanks,
tried all that, still no go.
simon
Click to expand...


Reset the bios

also...check the cmos battery


thought the machine should boot, even with no battery...
I've seen a few act flakey when the cmos battery was somewhere around 1.6
volts
 
philo said:
Reset the bios

also...check the cmos battery


thought the machine should boot, even with no battery...
I've seen a few act flakey when the cmos battery was somewhere around 1.6
volts
Click to expand...
Hi, thanks for the reply
nope, processor fan comes on flat out and nothing on the 4 diag leds on
the back of the pc.
I think I'll price up a replacement mobo and get back to the customer.
 
Hi,
got a customer dell here (dimension 4700) I'm pretty sure it's the mobo
on the way out. Symptoms:
Powered on it will either work ok until it gets halfway through booting
then freezes. Diagnostic leds are all green.
Other times powered on no leds show at all, processor fan runs flat out
and thats about all.
I've tried another psu and memory and tried the onboard graphics rather
than the pci express card (was removed for that test)

Any other ideas welcome :)
thanks.
Click to expand...

Does it freeze up in the BIOS setup screen?
 
JAD said:
Bench the board
clear the CMOS
no peripherals just PSU - video- memory- CPU/ HSF
Click to expand...
OK latest.
reseated heatsink new compound etc. Cleared the bios and the system then
worked fine. I let it do a virus scan and this ran quite happily for an
hour or so until it froze again.
Symptoms are back to the original again!!
New mobo ? - it's almost going to be easier to recommend a new base unit.
 
Simon said:
Hi,
got a customer dell here (dimension 4700) I'm
pretty sure it's the mobo on the way out.
Symptoms: Powered on it will either work ok
until it gets halfway through booting then
freezes. Diagnostic leds are all green. Other
times powered on no leds show at all, processor
fan runs flat out and thats about all. I've
tried another psu and memory and tried the
onboard graphics rather than the pci express
card (was removed for that test)

Any other ideas welcome :)
thanks.
Click to expand...

I have a few Optiplexs that did this. Turned out
it was the power supply.
 
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