Two weeks ago I was having issues booting my mid 2010 MBPro (flashing question mark folder) and posted a thread looking for help (see thread for previous steps taken). I was able to resolve my issue by resetting the NVRAM. This worked for me for about 3 days. When I was at my girlfriends I went to connect my MBPro to their new router and upon entering the password my laptop locked up. Spinning wheel and no other response. After about 10 minutes of nothing I held down the power button to reboot. When the screen lit up again I was faced with the same problem as before. Blinking question mark folder. I once again tried resetting the NVRAM but no luck this time... Now I'm prétty sure it's not the SSD because I put the old 320gb drive that came with my MBPro (still loaded with Mountain Lion) into it and was greeted by the same blinking folder on start up. Does anyone have any experience with this? I was told it could be the cable connecting the SSD to the motherboard as these notoriously fail in this model MBPro, but it makes no sense to me that resetting the NVRAM woud have any effect on a fautly cable. As a side note I am able to boot my MBPro from an external drive On the bright side I was able to do a fresh backup in the 3 days that I had it working again so at least I didn't lose any of my data. Any help is greatly appreciated. Cheers EDIT: I was able to resolve the issue by resetting the SMC. Considering my last fix worked for a whole 72 hours I'm sure I'll be posting again in the not to distant future.