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INSPIRON 5150 POWER SUPPLY, GOOD OR BAD?

Hi, I purchased this unit and was told it will run on a charged battery and the AC adapter doesn't always work.  I just want to know if you can test the output of the adapter to tell if it is good or not?  When I plug it into the computer the power light and HD light flash on then off and repeat this about every seven seconds.  It doesn't charge the battery in the computer.

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