Hi, I recently acquired an old Compaq SLT-286, but unfortunately, the power supply was not given to me. So I had to find a way of making it work by myself... I tried to connect a + 12 Vdc to the power connectors that normally are assigned to the battery. I put the ground on the most right pin, and a +12V on the most left one. The two middle pins were left unconnected, and of course, I removed the battery to avoid shortcuts. ( Ooops...when I say left/right, it's when the computer's screen is facing me, keyboard is removed, and the battery connector is located on the top/left corner :-) Like this : +------------------+ | **** | | ABCD | | | | | | | | | | | +------------------+ A : +12V D : GND BC : left unconnected With this, the computers boots normally on the floppy drive, but refuses to boot on the Hard drive. I obtain a 162 error message, inviting me to run SETUP. Then, I tried to run the compaq "setup.exe" diagnostic program, and I managed to see that my hard drive is perfectly recognized ! So, could anyone tell me il if I missed something ? Is my +12 Vdc connexion enough for powering the whole computer ? Actually I find very surprising that the battery's power connector has four pins, and I managed to do it work with only two :-( Thanks for your help, guys ! Sincerely, Fred.