New ISPconfig 3 Server/Ubuntu Server 12.04.2 - Error on boot!?!

Hi,

I'm setting up a new ISPconfig Server to try the Duo solution.. But after installing ubuntu and following the tutorial an error occured after rebooting the computer:

ERROR
server1 login [5.600132]
[drm:drm_edid_block_valid]
*Error* EDID checksum is invalid, remainder is 48
[5.600214] RAW EDID
[x.xxxxxx] xx xx xx xx xx xx xx xx (HEX characters)
[x.xxxxxx] xx xx xx xx xx xx xx xx (HEX characters)
[x.xxxxxx] xx xx xx xx xx xx xx xx (HEX characters)
[x.xxxxxx] xx xx xx xx xx xx xx xx (HEX characters)
[x.xxxxxx] xx xx xx xx xx xx xx xx (HEX characters)
etc.
etc.

Anyone got an idea??? Is it a RAM thing? The only thing I noticed was a funny RAM setup - a test revealed it to be set to 166MHz which I think is wrong for this particular system. But this is not the reason, is it?