Techno IDs - PLEASE HELP!

http://www.zshare.net/audio/170864946e806444/
http://www.zshare.net/audio/17086511def5928b/
http://www.zshare.net/audio/17086526411dfe87/
http://www.zshare.net/audio/170865469a8dc74a/
http://www.youtube.com/watch?v=IQTQVMN8H-k

Been trying to get these ID'd forever and starting to lose hope :( SOMEBODY out there must know them!

first one sounds like pounding grooves.. havent a clue what release or label though..

no idea of the others!