Laptop shuts down seconds after post. please help thanks [sorry is this the righ

Hello,
I am new to the forums but always knew toms hardware was a great site for articles and such.

okay,
The laptop is a Gateway nv54(Intel Pentium t4300 500gb hdd 4gb ram)

A first my friend had broke his screen, so i told him i could install the new one for free and i did so... now the computer only starts for about 30seconds and then shuts off. I can get into the bios and get to the windows 7 windows is starting screen.

I have quite a bit of experience working on desktop and i discharged my self before opening the computer.

I like to think that the motherboard isnt fried because the computer posts and i can enter bios just after a few seconds it shuts off instantly.

this is rather embarrassing because this problem did not happen before. I even tried to put the old screen in and see if something was wrong with this one but i am confident it isn't the screen.

Also(last thing) I am almost sure it isn't overheating because it is only on for 30 seconds and it dosent feel warm at all.

please help the computer is a work computer.

thanks
-ron

Sorry this dosent appear to be the right section for the post

i saw another person with an overheating problem in this section and thought it was but it isnt?

Ah its no problem. There been plenty of posts in the cpu section that could of been place else where in the forums and if need be, a mod can move the thread to the correct section of the forums.

Anyways, for the issue..

Only staying on for 30 seconds? Hmm..... only a guess but it almost sounds as if the cpu is overheating and shutting off the computer. What i mean by that during laptop replacement, the heat sink for the cpu may of managed to move around just enough an allow air to get in between the heat sink and the cpu causing thermal transfer to the heatsink to cease.

If this is case, you wont feel nearly as much heat as you would of felt if there is no air in between the 2.

Although the only way to be sure of that is try checking the temp in bios (if possible) and see if the temp is really hot (like 85C or above) or reapplying the thermal paste.

Maybe someone else has a different idea of what's going on but that's my first hunch.

i had some arctic silver already coming but thanks for the recommendation... i never took the computer completely apart but maybe it was moved when the screen was broke.

This topic has been moved from the section CPU & Components to section Laptops & Notebooks by Mousemonkey

Thanks