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Released December 8, 2009, the Toshiba Satellite L455D-S5976 has a silver upper case and a silver/black lower case. It has a 15.6 inch screen with TOSHIBA written in all capital letters on the back of it.

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How do I check to see if my motherboard is bad?

Screen went black on laptop, worked on external monitor for 3 days, then it went black too after I opened the back of laptop to inspect the CPU card. Hard drive has been checked & works good on another laptop, but won't work on my laptop (HDD light does not come on & won't spin). SD card light does not come on when SD card inserted. DVD spins when inserted. I replaced CPU card & no change. I think I might have damaged the motherboard somehow, but don't know how to check it. HELP?

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did you touched the RAM?

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Yes, I took it out & tested it in the other slot...it still did not fix the problem. How do I know if I need a new ram or if it's the inverter?

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Then try test it with other stick of ram... if its the inverter you should get image on an external monitor! if none of this works, you most likely have a graphics chip who needs a reballing!

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Peggy crwdns2934231:0crwdne2934231:0
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