Check and jiggle (yes, that's the technical term) the monitor cable at both ends to make sure the connection is tight. If this doesn't help, borrow a cable from another computer (or a friend) that you know works, and use that to connect the monitor to the computer. If the picture is no longer snowy, you have a bad cable; buy a replacement one from any number of dealers (I recommend http://www.discountcablestore.com/, they're just about the best prices anywhere, but if you don't feel comfortable ordering online, any store with an electronics department should have one.)
If it is still snowy, try plugging your computer into a different monitor and see if the picture is still snowy. If it isn't, then your monitor has probably gone bad; check it's warranty, and consider buying a replacement.
If it is still snowy, post back here with the name of your graphics card (in Windows, this can be found by pressing the Windows key and the R key at the same time, then typing in 'dxdiag' without the quotes, hitting Enter or OK, and looking at the 'Display' tab of the window that opens. If a warning message shows up about it being run for the first time, click OK or Yes.).
Good luck!
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