Chosen Solution
I have installed a new ADAT 500gb SSD in my girlfriends laptop. On start up I get kernel panics. After about 2 or three reboots I am able to log in. I have changed the flex cable (hard drive cable) twice so this is not the problem. I have emptied out the PRAM, tried smc resets, I am out of ideas. Furthermore I find the battery life is affected negatively. Could someone give me and idea of what to try next? Thanks
Kernel panic of what sort? Use Verbose Mode to have a detailed startup of your Mac and post a few photos of the moment it panics. Right upon hearing the startup chime, press and hold the Command (⌘) – V key combination for Verbose Mode To complete the answer giving credit to @danj “The other direction would be just to wipe the drive down and re-install the OS and the Apps carefully to see if a given add-on or app broke things. Sometimes malware or other nasty is the cause so the rebuilding from good known sources for the OS & Apps would clean that up. I would also scan the backup drive before moving anything over from it with a good antivirus / malware / trojan / spyware cleaner(s) as needed for the OS’s that are running on the system (MacOS / Windows / Linux) if you have more than one OS.” Try also booting from external hard drive via usb
