I installed a fresh Windows 8 (Pro) on my PC and when it gets to the log in screen, it just shuts down?
How can i fix this?
I have done some poking around and it seems there could be an issue with Hybrid Shutdown. This is along shot but this is how you can disable it.
You might need to do that in safe mode if you can get in that way... Buuut they changed something with safe mode... Hmm? Read this
If you cant get into safe mode try and do a normal full shutdown from power button on login screen? or just pull the power plug(I know-but that wont do the hybrid shut down thing and possibly let you in once to change the setting!)
Just solved this on a guess, remove your battery and start your machine with the charger. While it is starting unplug your charger, replace the battery and let it start up the second time. It should take a little longer than before and should stay on.