Studio Spot/Color data issues

got a rig consisting of 7 year old studio color 575's and studio spot 575 cmy's.
one of my studio colors doesnt receive data till about 6 hours after turning on at best.
one of the SS575's doesnt receive data at all, and another one receives data but gets locked up upon powering up, and displays either 0000 or UPLD and wont let me access the menu..
any help on this would be much much appreciated..
*fyi all data lines have been changed, along with terminators and still no results.
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