Auto detect analog input, entering power save message on my monitor screen, desktop DELL Dimension C521, pl. help

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Auto detect analog input, entering power save message on my monitor screen, desktop DELL Dimension C521, pl. help

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dell monitor says auto dtetect analog input, monitor is blank.

what do i do?

thx in advance for any suggestions

the last thing tht my son did on it before it went into power save was he used his USB wire and downloaded some itunes onto his phone

i love my old DELL desktop, use it for simple tasks,  take real good care of it, and want to keep it running.

Note:  I tied the suggestion but it did NOT work.  Need more troubleshooting suggestions please.

OS is vista

thx

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