I've got my original Pentium 133 here just went to grab some old files off it and on start up I get the message operating system not found. I go into bios (fixed disk setup) and under all the IDE adaptors it says none. I assume this means it is not recognizing the hard drive. Any comments would be helpful.

Thanks.

CMOS battery is likely dead or close to it. Might check in the BIOS for any hard drive autodetect options, and maybe open the chassis & ensure all drive cables are snug

You should be able to tell if the drive is at least spinning (by the sound) - if it isn't, not much hope, but try switching its power connector just in case

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Hi, I had the same problem and i was told that
the problem it could be the CMOS battery i replaced it and it solved my problem. this is a great place to get help. Tomd63