C-64 video glitch

From: Professor Dredd (profdredd_at_yahoo.com)
Date: 2002-02-11 22:46:50

One of my C-64s just started powering-up with a blue
border. When I "POKE 53280,x" nothing happens. When I "POKE
53281,x" the border color changes with the background.
Also, only four of the sprites are working.

I've been using it for about a year with a 512k 1764 and
SuperSnapshot plugged into a multi-port expanstion board.
I've got a "heavy duty" supply on it to provide extra
power. I have since removed everything from the cartridge
port but it still behaves the same. 

Can anyone offer guidance as to how I should proceed?

TIA

=====
go6502 - Commodore and Apple II news, programs, hardware and resources
http://www.geocities.com/profdredd

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