My laptop was running and it just cut off, now it won't boot back up. The light on the power switch comes on but it goes right back off after a few seconds.

SOURCE: Dell Inspiron 9200 will not boot.

If you could, warranty replace. Otherwise your probably best off getting a new laptop as out of warranty mobo's from dell can be pricey.

Testimonial: "Thanks."

SOURCE: power light comes on and then goes off.

power light comes on and then goes off

SOURCE: acer extensa 5420 that dosent want to boot...the

your bios in problem,some hardware can't recognize
go into nearest customer service center

SOURCE: will not boot i guess thats the problem

This issue could be due to presence of static charges or internal hardware malfunction of the notebook. To isolate the exact cause of the issue, perform the following steps.

Step 1: Hard Reset

To perform a hard reset, please follow the steps listed below:

1. Unplug the AC adapter from the notebook PC and remove from any port replicator or docking station.
2. Remove the battery from the notebook battery compartment.
3. Press and hold down the power button for about 20 seconds.
4. Insert the battery and plug the AC adapter back into the notebook PC.
5. Press the power button to turn the notebook PC back on.

This will discharge the static charges from the notebook. Now check for the issue. If the issue persists, then remove and reseat the memory modules of the notebook.

Step 2: Remove and reseat memory modules

You can refer the service manual provided below for information to remove and reseat the memory modules.

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01928566/c01928566.pdf

Refer page no: 60 & 61
NOTE: PDF manuals require the Adobe Acrobat Reader for viewing and printing.
However, if the issue still persists, then it is clear that the issue is due to internal hardware malfunction of the notebook and requires a detailed onsite diagnosis by a service technician. At this point, if your notebook is covered under HP warranty, then I suggest you to contact HP support to get the notebook repaired under warranty.

SOURCE: E system 1212 Laptop won't switch on. Power

Laptops are so integrated that usually a system failure that involves power issues such as in your case where you cant get it turn on with anything on the screen mean the mainboard (motherboard) is damaged. This usually leads to buying a new laptop or paying for the board to be replaced which usually costs as much as the laptop.