I am using HP probook 4540 s from last two years.
Initially it was having very good performance, but as the time passes it;s performance goes on down day by day. the problem of heatup, dvd drive not qorking has been start initially.
Now a new problem of starting was there in my laptop i.e. whenever I start my laptop without adopter it will shows serious errors like rebooting and all. I have also called HP service support to see the same but no positive response has been given by them.