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We have a Dell Optiplex 755 which is freezing at POST and displaying what appears to be a hexadecimal string in the top-left corner of the screen, like so:

6a3e100a6a3e100a6a3e100a

Any ideas on what is causing this?

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I'd strongly suggest looking at the Dell website and/or contacting Dell support. –  mdpc Dec 18 '12 at 19:56

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