I broke my MBA with TinkerTools

[zamoht]

Latest MBA, Yosemite installed.
Used TinkerTools and a guide to change the system font. All OK.
Doing a reboot. Ah - it's broken...

It starts, shows the Apple logo, progress bar. After a few seconds the spinning loading thing shows up. Goes very slow. Black. Spins. Black. And on and on. Doing the same if I start in safe mode.

What to do?!

 

[airlied]

Press and hind command+R simultaneously when you boot your Mac, it will take you to network recovery and then you just follow the instructions.

Please get away from any apps that modify your system.

 

[zamoht]

Yes, and thanks.

But argh - it was nice to see lucida grande again.

 

[Partron22]

Thanks for the post zamoht.
I shall wait a week or two before trying similar.
A 'definitive guide' will likely come out.