The reason why you might have problems seeing graphics in Juno is because you 
have an older version of the Juno software.  If you have a friend that has 
web access, I'd recommend you go to their house and download the latest 
version of Juno (1.49) from www.juno.com.
I was looking in my Client.Log file for Juno as well, and it also says in 
there "display does not support palette".  This may be some kind of internal 
command that does not even have to do with your computer.
So what I would do is download the latest version of Juno, install it, then 
see if you get juno graphics.
If you don't, I don't think it'll matter that much and you can try to ignore 
that error or complain to Juno about it.  
Quoting John Gardner To All:
I installed Juno ( Version 1.23 ) two weeks ago on my Pentium
computer and I have been able to send and receive text messages with no
problem. In the last two weeks I have received several ads ( less than
10 ads ) from Juno. All the ads are TEXT-ONLY with "No Graphics" being
received from Juno.
When I was installing Juno I seen a message stating
"display does not support PALETTE". This message appears also at the top
of the juno\bin\client.log file along with version 1.23.
A Pentium computer should be able to show graphics with no problem.
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