I installed forge 6.4.0.395 on 1.4.5, and when I load Minecraft, it validates it and everything works, but after the Mojang screen comes up, a black screen occurs.
Mods Installed(besides forge):
Advanced HUD mod 4.8DEV
Rei's Minimap 3.2_05 for 1.4.5
Plus, here is the bad thing: There are no logs. There are 3 FML log files, but none for the version I'm using,so they would be no use in helping to fix the problem.
EDIT: Uninstalled Advanced HUD and Rei's Minimap, still having the problem. now the only mod I have is forge.
EDIT 2: I just noticed I still had the Codechicken Core/ NEI from 1.4.4. I deleted them and it's fixed.
To anyone who gets a black screen using forge for the version of Minecraft you have: Check mods and coremods folder for mods for older versions of Minecraft.