Well I spent the day yesterday receiving a corrupt hard drive after a sudden black screen and then blank on boot.. given 10 minutes it restarted.

Today I got another... exactly the same symptoms..

https://www.change.org/p/timothy-d-cook-replace-or-fix-all-2011-macbook-pro-with-graphics-failure

It appears it's a wide spread graphics chip issue caused by the GPU desoldering it.

What really annoys me is that this MBP was to replace a MBP that failed with the nVidia GPU-gate GPU.. so that's 2 MBPs dead/poorly. The mac mini that was bought to cover short any issue occur is still working...