I'm not sure what is causing this, but this is the third time (though not in a row) that my MBP Mid 2007, with a Kingston SSD (not the stock HD that comes with this model) with Lion installed on it fails to boot up... I've had to erase and restore from back up 3 times. First Time this happened, it was after "updating" Snow Leopard to 10.6.8. (NOTE: TRIM was enabled via a utility I found HERE prior to update) Second Time was after Installing Lion from the App Store (TRIM was eventually enabled again prior to this failure) This last time was after backing up, then using the machine for 6 hours until I restart, and then there is this boot failure. (TRIM not Enabled for my Kingston Drive prior to this failure I think I learned my lesson ;-P ) But this last time I attempted to restore from back up, got an issue with time machine where my target volume "didn't have sufficient space" to restore from my latest back up...I had to pick a back up from a few days prior ;-) This is what happens NOW; turn power on apple logo shows gray progress bar quickly flashes machine cuts off Actions performed prior to failure: logged out of guest account* logged out of main account restart logged into main account [*]ran time machine back up used machine for a little while (mostly surfing) performed power down power on boot failure Wierd Symptoms before this recent failure to boot: Switching between logged in guest user account and main account seemed to hang or freeze pressing esc. unfreezes, login resumes (SL NEVER did this) user account login field finally appears after a long delay noticed a web page that appeared differently on my mac, than on others in the same room with me browsing to the same site... this behavior prompted me to restartafter which, my MBP fails to boot completely Wondering if my Kingston 128GB (system drive) has compatibility issues with this mid 2007 model MBP, or if Lion destroys my drive after about 3 weeks of use every time. Question: Anyone have any ideas on what could be causing the seemingly random boot failures? Anyone experiencing boot failures after powering down with a similar config? (MBP 3,1 Mid 2007, Kingston SSD installed) Anyone run Disk Utility only to find "Node Errors" preventing a disk repair? Anyone think it's ridiculous to have to erase and restore for the third time after your machine fails to boot up? I miss the stability of SL. Thoughts?