Mac Color Classic suddenly won’t finish boot anymore

[amedeo_68k]

Hi,
Starting today my color classic stopped working properly. It always catches error 11 just before loading Finder. I tried several boot disks. Same issue. Error 11 seems to be: SDM could not be initialized.
What is SDM ??

Do you have any idea?
Thank you

 

[amedeo_68k]

I also noticed that the internal HD is not recognized anymore, question mark, may be SDM is Scsi Device Manager ??
However it boots ( with error 11 ) from external SCSI ( scsi2sd )

 

[amedeo_68k]

Made a video. Also removed additional ram and vram

 

[bibilit]

SDM
11 dsMiscErr sdmInitErr
Miscellaneous hardware exception error

Have you tried booting with extensions OFF ?

 

[amedeo_68k]

Yes. No way. Several boot disks

 

[amedeo_68k]

Hi guys,
I pulled the logic board and clean up again with isopropyl and brush, now it works well again, however I’m still wondering on what the issue could be, the board apparently looks very clean. I have no idea

 

[3lectr1cPPC]

It could have been a bad contact for the logic board edge connector - simply pulling it out and putting it back in fixed it. Or simply a speck of cap crap somewhere that your first cleaning missed.