ss2sameer or Jake Lo, I'm not sure what wifi you guys are running in your 7510s (I have the Intel Dual-Band Wireless-AC 8260) Have either of you had any luck with the bluetooth? For me it seems to load/function every 50th boot, or so it seems.
As a note for other 7510s I also have black screen issues with my m2000m, but closing the lid and opening it does not fix them, seems like a luck of the draw on whether it boots all the way through to the login or just goes to black screen. I've tried dozens of things, but when it does load it, runs with full VRAM and acceleration.
Another side note, the only SMBIOS I've been able to boot, of the several I've tried, is MacBookPro13,3 with Board-ID Mac-27ADBB7B4CEE8E61.