Acer TravelMate 653 Laptop Power ON problem

Hello,

I am having Acer TravelMate 653. I just tried to open it just to have a look inside and Nothing else. But i failed to open it. So I again screwed it tightly and placed the battery back in the slot.
I then pushed the power on button as the battery was fully charged.
But it did not start .. as if the power button is not working.
But this is not at all possible.
I have handled it very carefully.
I dont think that there would be any hardware / software issue.
It was working perfectly before I tried to open it.
Plz. help.

Are there any security setup issue related that prohibit the use after someone tries to open the hardware... I dont know what happened.
Plz. suggest..
I have tried to recycle power by unplugging battery, power and holding power button ON for 58 seconds but this didn't worked.