So I have a very old 1996 Packard bell legend synera that refuses to boot from hard drives and dvd drives. It posts perfectly and I can access the bios. It detects the CD and hard drives fine. But I get a Disk I/0 error when trying to boot to the hard drive. It also refuses to boot from the CD drive and acts like it does not exist after detected it. I also noticed that the bios settings don't save after powering off. I have experimented and also found out that if I soft restart after saving with the cmos battery removed. It will not save the bios settings. It will save the settings with the battery installed if I soft reboot. But if I turn the power off than back on the settings are reset. I have played with all the jumpers using this guide and it makes no difference My mobo is a PB640: http://j12345.users1.50megs.com/menu/pb640/Pb640lay.asp.htm#jumpersI have tried several different Hard drives with the same problem. I only have one working dvd drive but I have tested it with another [strike][/strike]computer and it works fine. The original ACER one did come with the system, but does not read disk correctly. Here is a video demonstrating the problem: Yes its a adorable kitten X)[video="https://www.youtube.com/watch?v=7zTvWatxHek"][/video]