Quote:
Originally Posted by AntiSilence
Not strictly true. The PSU provides more than 1 supply rail... For example, there's a +5V rail, a +12V rail, and some other (including some negative rails, like -12V).
Each rail supplied power to different parts of the PC. The +12V rail, for example, supplies HDD's and GFX cards etc. If only part of a PSU has blown, the rest may work. EG, the +5 rail may still work.
PC power supplies are switched mode, and are really nasty beasts to fault find on, since all outputs only work correctly under load. Nasty.
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Spot on. That would explain it. The only activity on the motherboard was a DIMMLED', DIMMs require 5v usually (well I know some are different) don't they? They also said that the monitor had power (on pass through). I used the tester on the 4 pin molex connectors to the HD/CDROMs etc and they didn't indicate any power at all on the tester.
As I say the only led that lit from the PSU to the motherboard connector was the +5V one, suggesting that 12v etc. rails in the PSU had blown.
When I spoke to the witnesses :o), well, owners they said they hadn't heard the fan start up the last few days...
At a guess could the fan have been the PSU one, being thermo-controlled and this not starting up led the PSU to overheat and cause damage?
Does this all sound feasible?