Originally Posted by djsi38t
Can the voltage say in ones bios give any indication to the health of a psu?
Like the +5 12v etc. readings?
Yes, but there are some things to be aware of using these. First, make sure you're looking at reading from a bios that has a "Hardware Monitor" or similar function that's reading the voltage on the rails, and not looking at voltage settings. You're looking for these to be no more than +- 5% of their nominal values. i.e.
3.3V : 3.135V to 3.465V
5V : 4.75V to 5.25V
12V : 11.4V to 12.6V
Second, as others pointed out here it's preferable to use a multimeter to measure the power supply directly if you have one available. The reason being that there are errors introduced in the readings of the mainboard hardware monitor by its A/D converter accuracy and resolution and the voltage reference that it uses.