Wireless upgrade and screen goes dim questions? - 2different things in one thread

I have a T42.  Recent upgrade is replacing the hard drive and upgrade the RAM to max.  I am thinking of upgrading the wireless card to improve the internet speed.  Any suggestion?
The machine was not behaving lately.  The screen went dim (very dim) and sometimes black and white.  It seems that it went to battery mode by itself.  Wondering what causes this?  The machine was connected to AC and I set never hibernate and turn-off when AC plug-in.   
Thanks.

Cannot possibly be, as for one it is a desktop computer that has no power management, and two the menu bars, tools and everything else stays the same brightness, it is only the editing window itself.
Thank you for trying, it is appreciated.

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    Message was edited by: spudnuty
    Message was edited by: spudnuty

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