when you start your computer do you get any messages at all or does it just stay black? if you get nothing on your monitor you probably killed your motherboard and a replacement BIOS chip is needed.
EDIT: try clearing you CMOS over night to see if your computer can boot. here is a link with instructions to clear your CMOS
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for the SCSI error: you're using a SCSI HD so when you format you computer you have to hit F1 or the button it tells you to press during the windows installation to install your SCSI driver. It will than ask you to pop in your SCSI driver floppy. After that just follow the instructions on your screen.