I have a Griffin DB15 to VGA adapter which I use to hook my 6400 up to my KVM switch. Since I started using it (I had a Mac CRT before that) it's always bothered me that for some odd reason the black colour is grey and it seems no matter what colour settings I use it never becomes black. All the rest of the colours look ok. Anyone know what's wrong, the monitor is working fine on all my Windows machines.