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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
Sounds like the adapter is being overloaded ... Dell is one of 2 or 3 manufacturers using a 3 wire adapter plug jack. And ... well ... lets say they can be problematic ... it's a great system but very sensitive to battery malfunctions. I suggest you remove the battery then pug the adapter in ... if all is OK then have the battery checked
Power off the laptop.
Power it on and tap F2 at the Dell logo. check if the screen is sidways in the BIOS or not. If it looks normal in the BIOS restart the computer and go to control panel and uninstall the Video drivers. Restart the computer. It will boot up with basic drivers. Install the video drivers and the issue should be fixed.
If the display is side ways even in the BIOS try a BIOS update from support.dell.com and if you dont have an update reflash the BIOS with teh version availbale on the website.
Here is the list of all the drivers and downloads for your model. http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=INS_PNT_P4_1150&os=WW1&osl=en&catid=&impid=
-Yes you can reseat the lcd cable, follow some steps on your manuals ,If you dont have manula download the manuals from support.dell.com use your service tag. after reseating the lcd cable and still the screen is half ,try external monitor if the desktop is displaying properly may be you can consider that the lcd screen back light is damaged.try replacing the whole LCD or bring the whole system to a local store and repair the lcd back light.