MacBook Pro

MacBook Pro 2011 late, suddenly stops, hear three tones and again.

MacBook Pro 2011 late, suddenly stops, hear three tones and again. Does not start up. 16 GB of memory instead of max 8GB. On one module does start up and works normal. I have worked with the 16 GB for two years without any problem. Both modules are OK. No problem with hardwaretest found. I can work with 8GB but that's not wat I want. Is there a solution?

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