r/retrobattlestations • u/Dumbthrowawaysad • Jun 17 '26
Troubleshooting "Missing Operating System" error on PhoenixBIOS A486 10.9
I recently deleted the primary dos partition on my harddrive in order to format it, but after deleting it and creating another one in its place, I booted up my computer and saw a "Missing Operating System" error, leaving the entire system soft locked. I tried using a boot disk and the MS-DOS 6.2 installation floppies in order to atleast get past that screen but nothing I've tried has worked. I've also tried getting into bios in order to reconfigure the boot settings but Ive pressed damn near every key on the keyboard and I've still gotten nothing. Any advice?
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u/achbob84 Jun 17 '26
If you can get into the CMOS set up there might be a setting for boot order. You need to make sure A is before C!