wrote:
> Hi,
>
> There was some loud fan noise, so I sprayed canned air thoroughly
> throughout the computer case, now the computer is not starting
> properly. It lights up when pushing the power button, but the monitor
> displays "no signal". I remove and replace the ram, then it will boot
> up. When the power is turned off, then on again, the monitor
> displays "no signal" again, and removing the RAM allows a boot up.
> What seems to be the cpu heatsink fan noisily vibrating, may be the
> power supply unit. Because, when the fan is momentarily stopped an
> alternating sounding buzzing continues (although, the it tapers away).
> I appreciate any thoughts as to what may be the problem. Thank you.
>
> Nick
>
>
Your canned air has perhaps:
blown something conductive where it shouldn't be (e.g. a bit of solder
on to the memory connector or memory itself)
blown some dust where it is causing something (e.g. a fan) to draw
more current, overloading the power supply, which was on the brink
of being overloaded anyway (removing the memory causes the machine
as a whole to use less power)
blown a decoupling capacitor or other component in such a way that it
isn't functioning any longer (perhaps because it's no longer connected,
or the opposite -- shorted), degrading the power to part of the
motherboard enough to keep the machine from booting when the memory
is installed
something else :-)
I'd probably blow some more and see if you can reverse the damage.
Also make a careful visual inspection, looking for broken traces,
fans that don't turn, leaking capacitors, dust-bunnies, etc.
It might be cheap to get a new power supply and try that.
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