if you have some problem during boot, maybe you can find useful information at http://www.hwmakers.eu/raspberry-pi/raspberry-pi-sd-slot-replacement/
I overclocked to modest option. After reboot I get a login menu of Raspberrypi with option:
At installation and confif before I did not change password.
I try to login with username: pi and password; raspberry
No options do work to login again.
What to do??