A little while ago I posted regarding my monitor, its kind and whether an avga would work.  Well I know now that it is a standard res monitor.  The chassis is a definitely a 
Kortek / Sharp Image KTM-F/ KTX series
Ive got the avga hooked up properly, but the picture doesnt look right. The colors look weak.  When I play dvds everything looks kinda grey.  Is this because I need a video amp?
I dunno where to start addressing the problem; is there any way to tell whether this chassis expects 5 volts in?  If I get a video amp and plug it in when it isnt neccessary will I blow something up?