Need 28VDC 4Amp PS...

I saw a little more info on this topic. There are quite a few different Apple displays which use the ADC connector, and as you might imagine, the power demand of each one is different. The 17" Studio Display has a rated power demand of 40 watts, e.g.. Of course the bigger 23" displays and such will draw much more power. So, at 28V, if you could supply 1.5A you'd be okay, even with that display connected. Now, you've not going to get 1.5A at 28V stepping up the trickle supply, but the display isn't on while the computer is off, and once the computer comes on, there should be 30 or so amps available on the 5V supply. You'd just need to be sure to use a voltage booster which can handle the larger amperage and an ATX supply with a hefty 5V current rating. I think some of NS's boosters go as high as 3A. They have a nice table on their website which lists such characteristics. Jeff Walther