PS3 hard disks are encrypted in a way that they will only work wit the original console it came from... unless you format the disk so putting it into another one isn't an option, neither is plugging it into a PC as it's encrypted. I know this from experience
Though I did do the YLOD fix which got the PS3 working just long enough for me to copy off my most important save files so if you have the means and feel confident enough to do it, it may be worth a try.
Yeah i saw a few YLOD things but thought itd be easier to just try swapping hard disks but that didnt give me any save files. Which i know now why lol guess ill have to play fifa till i get bored enough of that to try gta v again. Or just wait for ps4 now save wasting my time lol cheers all