Help needed on Mac Book pro boot issue.

2015-04-13 20:20:31 +0530: Starting repair tool:
2015-04-13 20:20:31 +0530: Checking prerequisites
2015-04-13 20:20:31 +0530: Checking the partition list
2015-04-13 20:20:31 +0530: Adjusting partition map to fit whole disk as required
2015-04-13 20:20:31 +0530: Checking for an EFI system partition
2015-04-13 20:20:31 +0530: Checking the EFI system partition’s size
2015-04-13 20:20:31 +0530: Setting the EFI system partition’s size
2015-04-13 20:20:31 +0530: Creating a new EFI system partition
2015-04-13 20:20:31 +0530: Problems were encountered during repair of the partition map
2015-04-13 20:20:31 +0530: Error: Couldn’t repair the partition map because a new EFI system partition couldn’t be created.2015-04-13 20:20:32 +0530:
2015-04-13 20:20:32 +0530: : Couldn’t repair the partition map because a new EFI system partition couldn’t be created.
2015-04-13 20:20:32 +0530:
On my macbook pro, was running on Yosemite and suddenly on starting the system I see "prohibited" sign. After trying a lot of combination of keys,  I added external SSD and booted but it came up with Lion version.

Greetings skewat,
Welcome to the Apple Support Communities!
I understand that your Mac is booting to a prohibitory sign. In this situation, to help resolve the issue, I would suggest reading over and working through the information in the attached article. 
Mac OS X: Gray screen appears during startup - Apple Support
Cheers,
Joe

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