You're overtightening the screws and shorting one of the buttons, most likely the "VolDown" one or the trackpad. This way you force the phone to boot into HBOOT always, and the keys, of course, won't be responsive if one of them is constantly pressed.

Solution: don't do it.
Wiki on this forum exists for a reason. PLEASE READ THE WIKI BEFORE ASKING QUESTIONS.
Glacier (MyTouch 4G / Panache) Wiki
Nexus One Wiki
Nexus One FAQ.


[Lockscreen MOD] Trackball/trackpad wake-sleep toggle for Sense ROMs - [Nexus One], [MyTouch 4G]
[MOD]NoClock for Sense ROMs
[MOD] Change WiFi hostname

[MOD]Gallery3D with high-res patch, for stock and HTC cameras