Quote:
Originally Posted by Rob C
If the PSU has blown, then you'd have no activity at all on the PC, even the fans and LEDs, unless it's just the one output from the PSU.
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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.