The 8590c appears to have a P3-600 MHz CPU. The FAN for that CPU may require that third wire for speed monitoring and that "could" cause the machine to not boot if the incorrect fan is used.
Double check this and your work.
I was replacing my processor fan today with a new fan, as the old one was incredibly noisy (in an old HP Pavilion 8590c, if that matters). Anyway, I installed it just fine, booted up the computer and it turned on for maybe 10-15 seconds.
Then it turned itself off and now it wont turn back on. I know a good deal about computers, so at first I figured it was a power supply problem. I tried hooking up my other computer's power supply (550w compared to the HP's 160w). The same thing happened:
The computer wouldn't turn on or boot up anything. Yet, the power supply (in both cases) blows out a small amount of continuous air as soon as I insert the power cord into it. I dont have to turn the computer on (as that doesn't even do anything). As soon as I plug it in, the power supply sends out a small amount of air, and the computer remains unresponsive.
I tried removing everything from the power supply (hard drive, floppy, etc), as well as removing devices from the motherboard (soundcard, RAM, graphics card, etc). That didnt work.
So now, I am wondering if the motherboard in the HP Pavilion 8590c crapped out. Could the new fan have fried it out? ANY IDEAS?
Thanks in advance.