Monitor stop working after memory and usb 2.0 upgrade

Thanks, After I installed a usb 2.0 card and triple my memory size. my monitor after about an hour stop working. I tried everything (or almost everything that I know). I reseat the battery on the motherboarb, disconnect and reconnect almost every wire, use different monitors` that I know works, still their is no signal going to my monitor when I boot.Your help is greatly appreciated,thanks. specs: windows xp home edition
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More about monitor stop working memory upgrade
  1. the ram that u have installed is the problem-1>it might not be a good one(brand)
    or 2>try changing the ram sockets,,place the ram properly,,stifly into the slot...
  2. search for posts in hardware section, your problem is called "no video" and or "no post".
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