[SOLVED] MBP Late 2011 fault

[JockyMacIntosh]

My MacBookPro 17Inch is late 2011

After much trouble with previous drive only booting as far as login, I decided to upgrade to a Samsung 500Gb SSD.
Did a fresh install of Lion then upgraded to ElCapitan.
All was well, for a few days, when I started getting the same problem, only going as far as login then gray screen.
I then replaced the sata cable for the drive as I read that this can breakdown sometimes.
All was well for a few day then the same problem as before.
So I then cleaned the drive with disk utility and installed ElCapitan from USB.
Still no improvement.
It works for a few bootups then stalls.
Any advice appreciated

 

[velocityg4]

Have you done the standard PRAM and SMC resets?

 

[JockyMacIntosh]

Have you done the standard PRAM and SMC resets?

Yes I have done many times

 

[velocityg4]

Check if the SSD has a firmware update. Perform that update from a Windows or Linux computer. Some Samsung SSD have compatibility issues with macOS. At least I know they released a patch for compatibility issues with the 970 Evo Plus.

Run the Apple Hardware Test.
https://support.apple.com/en-us/HT201257

Is this an issue with just a clean install? Is it something which occurs only after restoring from Time Machine, Backup, &c or installing software?

Try just one RAM module installed. If it still occurs. Try with just the other module.

 

[JockyMacIntosh]

I was getting an error from the Ram test so replaced the module.
All seems to be well now