Display seems like 16 bit color with slight flicker

When I turned my iMac on today, it's like the display color spectrum is on 16 bit color and it has a flicker to it.
This happed all of the sudden.
It's less than a year old.
21" iMac
Intel Core 2 Duo
NVIDIA GeForce 9400
VRAM 256MB
Any ideas?

16bit colour is the default maximum colour depth for RDP connections to a windows terminal server. You can increase this by editing the local group policy object on the windows machine.
Go to start->run and type gpedit.msc
Browse to Computer Configuration/Administrative Template/Windows Components/Terminal Services and edit the "Limit Maximum colour depth properties" key. Set it to enabled and select 24 bit. Click OK close group policy editor. You should now be able to get 24bit colour over RDP connections.

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Display seems like 16 bit color with slight flicker

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