Usually the jumpers will be labeled m a for master and s l for slave and c s for cable select. Some hard drives arent labeled like this, instead they are labeled as jmp50 etc. The hard drive in this computer is the origenal? It would boot OK before you tried installing the c d rom? Whear did you get the c d rom from? Did it come out of a known working computer? Pete ----- Original Message ----- From: Alex Snow <alex_snow@xxxxxxx> To: <speakup at braille.uwo.ca> Sent: Thursday, March 07, 2002 6:57 PM Subject: Hardware Question Hi. I am installing a temperary verson of linux on an old 486 box. To Get linux from the winblows machine to the 486, I need to install a CDrom. I hooked it to the same ribbon as the hd since there was room, but it won't boot with the cdrom on the controler. How do I tell the hd to be master and cdrom to be slave?