Modern power supplies (all of the ones in computer now) are switching
supplies. This makes them more efficient, but they also need a load to
operate properly. You can buy a resistor with a connector for such purposes
- available from suppliers such as www.cyberguys.com for example. Once the
load is connected, you can measure the voltages on the leads. You should
have 5v, +12, and -12. I have been out of it for a while, so there may be
additional voltages on the ATX supplies. NEVER TEST A SUPPLY WITHOUT A LOAD
CONNECTED.

Peter
-----------------------------------------------
The NoSpin Group
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> -----Original Message-----
>  Is there a way I can test an old power supply with a
> multimeter to make sure it's working properly before plugging
> it into a motherboard? Thanks. -Barry

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