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dougal
22nd January 2015, 16:19
When switched on the blue screen appears but its full of random garbage characters that seems to change when switched on/off.

Its a breadbin model. Is it faulty RAM ?

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Sometimes some of the garbage characters are changing on their own

roy_bates
22nd January 2015, 16:23
could be faulty ram or one of the roms for starters or maybe one or more 74 logic

what model c64 is it bud?

is the power supply ok?

dougal
22nd January 2015, 16:24
Its a breadbin model


could be faulty ram or one of the roms for starters or maybe one or more 74 logic

what model c64 is it bud?

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Sometimes it gives black screen too

roy_bates
22nd January 2015, 16:39
can you say what board assembly it is inside? 250425 or 250407?

kenshigros
22nd January 2015, 20:28
ftp://www.zimmers.net/pub/cbm/documents/repair/troubleshooting-c64.txt