That sounds like Samasi mac. Basically, the capacitors on the logic board have gone bad. The Samasi effect or "Zebra Stripes" appears on Macs with memory-mapped screens. You are looking directly into memory at the garbage that is there. Dynamic RAM is built from tiny capacitors, and cannot remain stable when there is not enough capacitance nearby to smooth out transient power effects.
On Tue, Oct 2, 2012 at 1:46 PM, Fred <[email protected]> wrote: > I just retrieved my Mac Classic from storage and turned it on but I > just got a checkerboard screen. I inserted the 'Startup Disk' but now I > have the same checkerboard screen and I need help to get the floppy out and > some advice on how to properly startup the computer. thx ... > > -- > ----- > You received this message because you are a member of the Vintage Macs > group. > The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our > netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected] > To leave this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/vintage-macs > > Support for older Macs: http://lowendmac.com/services/ -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
