IIgs not starting up, garbled graphics

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IIgs not starting up, garbled graphics

Hey there, Apple chums! ;)

 

Frank from Germany here, nice to talk to you all again, asking for your advice.

 

So my IIgs won't start anymore. After switchng on I either get what looks like a big fat inverted L or some colourful patterns. Resetting the machine with CTRL-Reset I get, in turn, black screens, random characters, or blue, green, red, purple, or a mixture of all garbage graphics.

 

Does thing ring a bell to any of you IIgs buffs? CPU or ROM, perhaps? My machine is a ROM 01 BTW.

 

Thanks in advance for any input,

Frank