I have an 19 inch LCD display I got for $5 at a junkyard.  I hacked  
together a 24V 2A supply for it.   It works fine except.......
It is a second monitor for my MacBook.  When my MacBook goes to sleep,  
the display goes black.  When I wake my MacBook up, often the extra  
display is torn horizontally.  The right and left edges have jagged  
edges with a periodicity of about 4 mm.   At first I would turn the  
display on and off and eventually it would stabilize.   Then I  
accidently noticed that if I left it alone for 90 seconds .... the  
jags would get larger in periodicity and eventually would reach about  
20 cm at which point the display stabilizes.

What might be causing this behaviour ?

Gus
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