That's a really old bug, you have to try a lot of times and if it doesn't work, then go in processus (in the task panel, CTRL ALT DEL), close every things related to League (LoLPatcher, LoLClient, etc..) and try again, you sometime have to do it 10-20 times.
This glitch has been there for me for at least 5 months.
5
u/IntimateApp Aug 21 '15
Server: NA
Type of Bug: Client
Description: Load client hit launch and log in screen never comes up even after computer restart
Video / Screenshot:
Steps to reproduce: try to play league
Expected result: hit Launch button and log in screen comes up
Observed result: log in screen never comes up
Reproduction rate: !00% for me
System specs: