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The original Macintosh desktop computer, initially released as the "Apple Macintosh" in 1984.

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Computer restarts in the middle of disk boot

I am trying to boot an original Macintosh. I have 4 different bootable disks, each results in a happy face and the computer proceeds to boot from them, but then about a couple seconds into the process the computer resets and goes back to the power-on startup screen.

Any ideas what might be causing this? Dirty heads? Bad RAM?

Thanks!

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If the disks are known good and you can boot from then on an other Mac 128K, then there is most likely something wrong with the drive or perhaps something on logic board.

However, the RAM problems usually result in sad Mac with the error code.

Usually there is a problem with floppy drive, as the mechanism gets stuck as the old grease hardens and the head assembly would then have a problem advancing on its rails, so it would only read track 0 properly. It is a main part of a Classic Mac restoration/repair to disassemble/clean/lubricate these old drives.

I did have problems on a 128K with the boot disks prepared from disk images on a 1998 PowerBook G3 Wallstreet. It just didn’t like them, but disks that were prepared on a Mac SE/30 worked perfectly. Also I needed to use actual 800K disks, not the 1.4M ones.

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Sellam Ismail さん、ありがとうございました!
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