8200 inspiron wont start up

You may have a burnt board or the input pin is bad, try wiggling the pin while it is plugged in to see if you can at least get the fans to start you obviously have a short of power in the power button area. You may want to try replacing the power button board for your model this may offer you a solution. If you take it in they can test it with a meter to make sure that this is the problem before a board issue is determined. It is difficult to diagnose this kind of things without the machine in front of me. My advice is to take it in and have the power investigated.
Just because the lighting on the battery is going and showing signs of life does not mean the power button is not bad or not getting the proper power to start the computer. It seems to me that the power button board is bad. Or the input cord pin may be shorted out and only supplying power to the mains but not the power button circuitry. Just a good guess!......John

Have you tired using the electric cable instead of the battery? I presume you have. Does sound like it could be down to the power management in that case.

Try a different power outlet, or plug directly into the wall.
This does sound like a bad power supply. You can get replacement power supplies just about everywhere computers are sold. It'll set you back about $50 and is relatively easy to install.
-=/ Daft Tech /=-

there is power buttom on the keyboard makes it wake up. try it

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i cant if my mute botton it all was say mute of and i cant hear anything

Maybe there are some problem in your start button (the button wire connect to mainboard is Loosening.

Please press the start button for about 3-4 seconds then see it would start. Always it may solve the problem, this happend to my inspiron 6400 too, after used for years the start button failure. It shows only power lamp lights green but the other light cant light red.

If no, maybe your must change a power supply, as the lower volt current cant start all the device.

Latitudes sometimes have a problem with RAM. Try these things to get it to boot...
1. Remove the RAM modules, clean the contacts with a pencil eraser, reseat modules and test.
2. If two modules, remove one and test. Place same module in second slot and test.
db

There is not a reset button that model. The only other way to force restart it would be to unplug the computer from the outlet. This is not a recommended method but, it can be used a last resort if your computer is hanging.

motherboard chipset problem dude.