Mikrotik CRS226-24G-2S+RM not booting

I have tree switches. Two of them are working just fine.
The last one did not boot up after a power failure on the main supply of my house.
It stopped on “loading kernel from nand”. I then found a guide: http://forum.mikrotik.com/t/new-rb951g-2hnd-bricked-solved-with-netinstall/70728/1 to use netinstall to install routerOS.
I followed that guide, rebooted. And now it’s stuck on “starting services”.
I’ve tried to reboot again, but nothing different.

After som more testing, It now boots to ether boot. And if I run netinstall on my computer, the switch stops at “netinstall” in the LCD.

Any good ideas?