constant shutdown of laptop

hi
i bought this laptop, sony vaio vpceb16fg about an year ago
half-way, the screen broke and i had to get it replaced
it took about a month for the screen to arrive, so meanwhile, i used my laptop on my lcd screen through hdmi cable
it gave no trouble at all
then, my screen finally arrived, nd the problems began
my laptop started getting hot nd shutdowns were constant
i thought maybe formatting would help
bt
it only worsened the problems
format was tough since it would shutdown in mid way
gow-ever after 4 days of trying, it finally did
then also, the problems didn't stop
after that, when ever i try to rate the laptop, from the games folder (i have windows 7 home premium 64 bit), it goes half way through, the fan starts starts rotating like mad, and finally with a clicking noise, the laptop shuts down, i even got the hard disk replaced, still, the same problem is there, help
what should i do ?

 

How about Warranty !???

 

yes, i still have warranty left, about a month