If you live in fear of your efforts of "fixing" your ST/Falcon PSU (which you should be as falcons are kinda expensive!) Then I suggest buying these dummy load resistors to test your PSU under load before reinstalling it back into your machine. NOTE you CANNOT test switchmode PSUs without a load, it will malfunction! 5V (red) uses 2.2R (or 3R) and 12V (blue) uses 10R (or 22R) Then you can measure the PSU under the load resistors and make sure the voltages are correct. Note these resistors are rating for continuous use, but get EXTREMELY HOT very quickly. So I suggest not running them for more than 30 seconds at a time.