... Of the 4 sticks of 512kb VRAM I have recently bought 2 have -10, one -8, and one -7.
I am guessing that as the LC475 requires a pair of 80ns VRAM sticks I currently do not have the correct specification ...

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If, being of a tidy cast of mind, you used the pair of 100ns, they are too slow for the 475, no matter that the slower LC can use 100ns. You could hazard using the two faster cards, which would allow the the System to treat them both as 80ns, with a very good chance that they would work. (Ideally, you will use two completely-matched VRAM cards of 80ns or faster.) If that does not get you going, it is more than possible that you have a separate problem from that of the VRAM specification, relating to the VRAM slots, your PRAM battery (because the video characteristics are stored there for the startup process), and so on.

de

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I've tried every combination possible from the 4 sticks of VRAM in 2 different LC475s. Both machines work perfectly with the smaller 256kb sticks installed.

One of the machines does have a dead PRAM battery and I have to 'jump start' it each time I power it up, however the second machine has a good battery that was new less than 6 months ago.

I'm guessing that the -8 and -7 set of sticks should work in the machine but it seems I'm out of luck!

It has been mentioned in an earlier post to this thread that the VRAM should be installed as a matched pair.....I might have to buy yet more VRAM, I've spend more on shipping alone for the last 2 sets than the LC475 is worth but it's become something of a quest for me to actually make it work now!

If anybody reading this has a pair of 512kb sticks I can buy that will work in this machine please drop me a line..

Thanks to everybody who has posted so far to try and help, all of your time, effort and knowledge is much appreciated.

Phil