Hi, My Macbook Pro 8,1 (early 2011) El Capitan 10.11.3 all updates done, worked fine for 9 months, with an OWC Electra 6GB (240 GB), then it sort of stopped working, testing very slow speeds. At first I thougt it was the Mac that needed replacing, but meanwhile my thoughts about that have changed, but I am in the dark about whats going on. I was send a new 6 GB SSD and got the following results: After intallation in the Macbook Pro: Internet recovery not possible Clean OS via USB stick not possible Connected as Hard drive via Thunderbolt to my iMac => very slow speed (Black Magic) After placing it in an external dock, connected via Firewire: Clean OS via USB stick succeeds, Macbook Pro will run via external SSD Installing the SSD with the clean OS in the Macbook => Macbook Pro doesn't run (very slow and gets stuck) I was send an Electra 3GB because the idea was that this Mac is the first to be able to have 6GB disk and that might be the problem (although it worked fine for 9 months..) The Electra 3 GB has the exact same behaviour in my Macbook Pro. All disks tested fine in Drive DX So why do I think my Macbook Pro isn't broken? My Mac still works fine with the original 320 GB SSD! BTW; I have done SMC and VRAMM (PRAMM?) resets. Only thing noticeably wrong with the Macbook Pro is that USB port farthest away doesn't work any more (for over a year) I'm really stuck, so help is appriciated!