I have been using one large monitor for the past several years, a Samsung SyncMaster 213T. Recently I purchased a 20" Viewsonic and made it my secondary monitor. I actually have three monitors - Laptop's native screen, Viewsonic and my Samsung running on my desktop but available as monitor 3 using software www.maxivista.com.
My Samsung is attached to a dual head card on the digital output. My Viewsonic attached the analog port on the laptop.
My Samsung can't show me clean white as the new Viewsonic can. No setting or adjustment will make it even come close. Whites are more like gray.
Side by side, the difference is so bad that I'm almost considering selling the Samsung to buy another Viewsonic. I'm not making a comment about brand, but I live in Thailand where they rip you off for anything electronic so I'll buy what isn't cost prohibitive.
My Samsung used to be on the laptop but because it seemed fuzzy or not quite right, I moved it to the digital card and put the new Viewsonic in front of my face.
Is it showing signs of old age or is something else going on?
FWIW - I'm a computer consultant - have both monitors on their correct settings.