11.10 - Unable to boot after new kernel installation

I have installed Ubuntu 11.10 in my laptop. Recently I compiled and installed a 2.6.38 for LTTng kernel trace purpose. After installation when I reboot I could not boot either to the default kernel or to 2.6.38. When I boot to these kernel it shows the following messages and then hangs:

Stopping Save kernel messages.     [ok]
Starting Bluetooth                 [ok]
Pulsed audio configured for per-user sessons
sand disable
edit /etc/default/sand

I have tried Alt+Ctrl+F1 and updated the grub2, still not working. Kindly help me