This IBM PS/valuepoint 433DX is dead. I replaced the power supply and power switch but that didn't work. The monitor plugs into the power supply and it powers up. The monitor gets power but the computer dosen't. It did the same exact thing with the old power supply and switch too. Both of the power supplies fans don't even move. This power supply has the power switch to turn it on and off wired directly to the power supply its self and not to the motherboard. I would think if i turned on the power switch the fan in the power supply would move even if the motherboard is fried. Do you think i have two bad power supplies or is something messed up on the motherboard? Thanks

I believe power to the monitor receptacle is by means of a 'pass- through' and is not provided by the supply itself. Are you certain you've plugged the leads into the motherboard correctly? If they are reversed, then the PSU fan will not turn. We have nothing against ideas. We're against people spreading them. - General Augusto Pinochet of Chile

Thanks for your reply. im sure the leads are plugged in right. The two leads from the power supply are keyed. The plugs on the mother board have small slots for the correct lead. I would have to break off the little things on the leads in order to plug them in wrong

On some, the pair of leads is labelled 'P8' and 'P9' and it is quite easy to switch one for the other. If yours consists of 2 separate plugs, then the black wires should be together in the middle. It seems unlikely that both supplies are bad. When not plugged into anything, does the PSU fan spin? If you disconnect the hard drive, does that make a difference? We have nothing against ideas. We're against people spreading them. - General Augusto Pinochet of Chile

P8 and P9 are plugged in right..the black wires are in the middle. I double checked all the plugs to make sure they where down tight. I tried with the hard drive unplugged and the other drives unplugged too. The power supply does make a slight noise and the fan jumps just a little but it still won't turn. The new PS is refurbished and was poorly shipped in a box with no padding. I dont know if that has anything to do with it or not.

Ok - just needed to be sure, those symptoms are exactly what you'd get with the leads switched as well - right down to the slight motion of the fan. If good, the power supply should spin up when disconnected from the motherboard - although you could try just connecting it to a floppy drive or similar to put a load on the supply. If the supply powers up then you would have to suspect the board. Pretty old model - I acquired one last year, although I did end up fitting a Pentium board into it, the original mobo still worked. We have nothing against ideas. We're against people spreading them. - General Augusto Pinochet of Chile

Thanks for the replies. I plugged a cd rom into the power suply too and the door wouldn't even open. I'll send the PS back and get another one. Can i use a 300 watt power supply with a power switch on the back of the supply instead of the astec PS without frying the computer?