Does this sound like a bad video card?
My granddaughter's PC's HD clinkered, I installed another, Fdisked and formated it with no problem. When I started to install Win98, after the scandisk is finished the video drops to a scrambled color ban across the middle half of the screen.
This is a 586 with 20mb ram and a 1gb hd.
KT7-Raid W/800 T-Bird, 192MB RAM
Raid 0 WD 20GB ATA66 & Samsung 6.5GB ATA33
Diamond Viper V550 AGP
Sound Blaster Live
Adaptec AVA 2906 SCSI
US Robotics 56K Voice