Take both keyboard, mouse off the machine just in case, When diagnosing the power problem, I always take ALL detachable parts off and try each one by one until I nab the guilty party. First, unhook all 3 hard drives and throw the power switch and see if you can wake up the computer. Then hook *one* hd just by power only and try, then power off, hook the scsi cable back on, pin 1 to pin 1 on motherboard see that also striped side of ribbon cable next to power connector and try again. Stripe is given as pin 1 wire. Those RZ23 is conners 100mb I think, and does only draw less than 8 Watt each at spinup. In my repair, I test for opens and shorts in power semiconductor components, visiually eye all passive comonents for burns or deformations (capacitors tops bulged or blown open, smelly if soldering that capacitor's legs). But now I could do better now that I got ESR meter to check most of capacitor's health. This does not require that shematics to do that! I never had one at all fixing anything from VCRs, TV's, monitors, even computer boards. Also check all power resistors for opens and creepage in resistance changes from rated markings. Most of trannys are like two diodes back to back. And FET and MOSFET have bit different reactions to meter probing when in circuit and out of circuit. In any switching or linear power supplies easier to disconnect just one big transformer totally out of circuit to get best meseaurements. When I find one or few power resistors (usually fusiable resistor) totally block of carbon, look at other living PSU of same make or jump on the sci.electronics.components or sci.electronics.repair to get correct resistor values or ask here! Troll