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Your not getting power? When you plug the laptop in does the Battery charge light come on? Are you getting power to the laptop? Do you have a multimeter to verify voltage from th AC outlet to the AC jack? Or ,the power gets to the laptop and push the on/off button you get no response? Or, you push the on/off button and the laptop starts then shut down? No lights, no leds blink. Remove battery, Try another cord/charger. Has it been dropped or damaged that would jar loose a connection, or pulled by the cord resulting in a damaged AC jack?
Check the time if you can, doubt it since it can not display anything. This usually happen when: 1. The memory card is bad, needs to be replace. 2. The video card is bad. Since it's a laptop, then the problem is with in the motherboard. Sometimes when the BIOS battery is drained, it also stop the computer from displaying. To see the battery you must take apart the computer. And the last thing in the list is the monitor it self. Maybe the monitor got damage some how and it won't display anything. To troubleshoot, I recommend you start with the memory, and since the computer must be 64 bits, it needs 2 memory card of at least 2gb. each stick, if one of them is damage and both are still connected to the motherboard, the monitor won't display anything either.
First off, we'll need to reseat most of the parts connected to the motherboard. That includes memory, video card, audio card and the others. What you need to do is to remove everything from the motherboard, connect them one by one. Once you have connected a part/device, try to boot it up. Do this until you have isolated the problem.
The hardware that is common to this issue that you're having is the memory stick. But, we really need to isolate the cause of the problem.
Power up the external monitor first and then boot up the laptop, the video info will automatically divert to the external monitor. If you do not see a Windows image on the external monitor then it is definitely a motherboard issue, because the video card is built in on the motherboard. The Video card uses shared RAM (part of the RAM module/s ), try re-seating the RAM modules, also test the RAM modules. You can test the hard drive by removing the hard drive and connecting it to an USB hard drive adapter, then connect the adapter into a working computer's USB port. If the hard drive is OK, this computer will see it as an external storage device and you can open the various folders and files on the hard drive.
Sounds like the motherboard, BUT have you dismantled the computer. Remove the RAM the drives, The HDD, the BIOS battery, the power cord, the computer battery and everything that can be removed relatively easily. Clean everything out with compressed air. Not to crazy though...take it easy!
If a friend has a similar computer try the screen on his once its removed.
Once clean reassemble.
Dells shortcuts are a little different than others. You may need to press F2 and run diagnostics from the boot menu or F8, or F12 which brings you to the BIOS. All at startup. Not 100% sure on ur Dell but it is on mine.
From this point I'm not sure...Hopefully this will help get you in the right direction. Best of luck!
I had one with the same symptoms, the way i fixed it is by taking it all apart and resolder the system chasis grounds on the mother board, then reseting the motherboard's memory battery. A bit complicated for those with little knowledge on computer repair. You may have to take it to a computer shop, or try fixing it yourself. It took a while to figure it out.