Hi I have been fixing windows computers for nearly 15 years. But rarely touched Mac. Have a customer at the moment where the MacBook was reported as going slow and then wouldn't boot. Was getting flashing folder with question mark. Tried all the fixes with no luck. Went into internet repair tried repairing the SSD within disk utilities. Came up with error and wouldn't fix so I recomended a new SSD was needed. Bought an identical SSD and again tried to install OS x mountain lion via Internet. The time was something stupid like 80 hours remaining. Left it running Friday evening to Sunday evening and progress Bar got 1/3 way. Tried this again over a further 24 hours. No luck. Borrowed USB with the latest OS x on. tried that and just failed. Managed to get old SSD booting via external USB to data caddy. Built a fresh Mavericks usb installer. Tried this but failed. Looking at the error logs it says missing core-services. I have formatted the new SSD. followed all instructions online etc. but at a loss now. Could it be a faulty SSD that I have bought. Will it work if I try a normal 2.5" says HDD? Can someone please help Thanks.