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Helpful answers
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Apr 20, 2014 3:28 AM in response to grcn_zgrby pennbank,see
http://support.apple.com/kb/HT2090
- Reset SMC or PMU
Reset your computer's SMC or PMU, and then check System Profiler again. (SMC reset instructions for iMac G5 (iSight), Intel-based iMacs; PMU reset instructions for MacBook and MacBook Pro.)
You do not show what mac/operating system you have
- Reset SMC or PMU
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Apr 20, 2014 8:43 AM in response to grcn_zgrby EZ Jim,if your Mac runs OS X 10.9.x, see http://discussions.apple.com/docs/DOC-6431
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Apr 20, 2014 2:01 PM in response to EZ Jimby grcn_zgr,thaks I've tried everything but not working I am afraid is a hardware problem
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Apr 21, 2014 8:01 AM in response to grcn_zgrby EZ Jim,grcn_zgr wrote: ... I am afraid is a hardware problem ...
Then Contact Apple Support or an Apple Authorized Service Provider for service.