Laptop won't turn on

[sunxin8086]

I have a 4 years old dell e1505. It will feeze after running for a while, and I suspected that the cooling system is not working correctly because of all the dirt. I disassembled it and cleaned the cooling component and cpu fan. After reassembling it, my laptop won't turn on. When I pressed the power button, the three green lights on the left (I think they are number, shift and one with down arrown) , and the power light will turn on. After 2-3 secs, they will all go off. Can anyone tell me what this means? is there anyway to save my laptop?

 

[buwish]

Its an indication that something isn't hooked up right. I'd take it back apart and ensure that everything is hooked up correctly.

 

[sunxin8086]

What could the component that wasn't hooked up right? The components I took a apart is cooling fan, touch pad, display and keyboard. I suppose if its other then the display, it will still start and show a warning that keyboard wasn't found or something like this.

 

[sunxin8086]

After tried to re-assemble, one of the green light on the left won't eve turn on now. Its the middle one with a letter A on it. I think it is the shift lock. I am desperately needing some help now. here is a pic.

 

[sunxin8086]

Any idea whats wrong with my laptop? I am getting frustrated. Please help.

Its an indication that something isn't hooked up right. I'd take it back apart and ensure that everything is hooked up correctly.