Upgrade Kernel 640:Oracle DB not start

Hi

i was installed WAS 640 on my test sys. kernel version was 640 and patch level 43.

And i was try to Upgrade latest Kernel 640 and patch level 196.

when i try to up server, it is not up bacause DB was not start (shows dbstr.cmd was failed to connect)

what was the solution??????

regards

raghu