Sandisk Extreme 120gb SSD unrecognised by computer.

Yes, the SSD is detected everytime in my desktop PC but only sometimes in my laptop. Depending on where i try to put it (I have two hdd in my laptop = msi GX780R) it is never detected, the PC responses slow or it sometimes could be detected in BIOS but then not from Win7.
With the original hdd,the laptop works perfect in ahci mode.

here there are three ways to fix this:

https://www.iseepassword.com/windows-wont-recognize-from-ssd.html