Mac OS X Lion install problem

[aman099141]

i have snow leopard installed on my macbook. recently, i upgraded it to lion,everything was running smooth till an unkonwn error came up "please shut down using power key" and the same warning in several other languages and dislog box was black in color and since then its coming up again and again everytime i boot up the os.please help

 

[maflynn]

That is a Kernel panic and it shows up when the operating system incurs an error that it cannot recover from, most of the time its the result of a hardware failure.

Try booting up into the Recovery partition (cmd-r on boot up) and see you can check the drive from there,