HT204347: How to find the serial number of your MacBook Pro
Learn about How to find the serial number of your MacBook Pro
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Helpful answers
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Mar 6, 2015 1:54 AM in response to alias.rocksby lllaass,Try resetting the SMC and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
Boot to Recovery and then try repairing the startup disk
OS X: About OS X Recovery - Apple Support
Last, reinstall the OS