I've got a box full of old PS, and I would like to quickly weed out the bad ones. I've got three testers, Power and Cooling with a resistor pack and single led, cheap 10 led tester, and deluxe version with a nice backlit display that shows numerical values for 6 things. Using this last tester, some PS have been clearly bad, no start, or voltages too low (like less than 4.7 on the 5v). Should I use the voltage ranges in your earlier post, or should I be making some adjustment for no or little load? I do plug in a hard drive if a PS looks basically good. Most of these are for OLD systems, 20 pin ATX etc., any adjustments on that basis? Thanks, good thread.