Ok so heres the story, was trying to upgrade my fathers old pentium II with more ram and a bigger harddrive cuz he uses it just for work and doesn't need much but the 2 gig harddrive was full and had little ram. Well the 4.51 Bios wouldn't accept the harddrive because of the size and setting the cylinder limitation jumpers on the harddrive didn't work. So I was going to be risky and update the bios which is what maxtor recommended I do to get it to work. I didn't get to even make the disk to reboot the new bios due to the fact that the disks protective slide cover came off and was inside the floppy drive, so I unplugged it and took it out and held it upside down and it fell out, so far so good. Well when I went to plug in the floppy drive I wasn't thinking, cuz I was in a hurry and it was late, I plugged the plug in the wrong way and the computer died and when restarted won't even boot to bios. So my question is, did I fry the motherboard or the cpu and can I check them? I tried to reset the cmos by removing the battery and waiting, and also tried to jump the clrtc after reading similar problems on the web, but still no go. I also tried different ram. My computer I am on is also a slot1 but with a pent III chip, can I exchange the cpu's just to see if its the chip or is this risking my other computer cuz the aren't sync'd right? Can I replace the bios chip? I know this is an old system but as my father already ordered a new one I would like to fix this one and give it to a friend, and I just hate to scrap this thing. I think these old Mobo's are cheap and I have see that a new bios chip is under 30$.+ the puller. I have never built one myself and would like to ask the gurus here what they think. Please help. Thanks everyone!