I just replaced the screen and it was working on day 1 and 2. Today is day 3 but it is not coming on. Connecting an external screen works. How do I check whether the new screen is faulty or is there another problem?
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Have you tried this: 1. After removing the battery 2. Press and hold the power button for at least 10 sec. 3. Put back the battery 4. Turn it on
if this doesnt work, there could be a problem with your operating system. Try accessing safe mode if you can login .TAP F8 continously on the dell logo screen, and it will open advance boot options. (Just select safe mode) If safe mode boots properly try running system restore to restore it back to the previous date where your computer is still booting to windows. Hope this helps
This is most likely going to be a loose connection. You will need to take the the plastic bezel that surrounds the screen off, the screws are hidden under the small rubber bumpers. Then take the screen loose, you will see he four screws holding the screen at the sides. Tilt the screen forward and you will see the connection on the back. Make sure this connection is seated properly, you may need to apply some new tape on it if it has any. Then check any other connections while you're there. If the problem persists, then the cable may need replacing.
On ac power when you hit the power button, if there are no lights, it could be the power supply. If there are lights, try starting it without the battery, ac only. If there are lights and it still doesn't start after removing the battery, try a different memory chip. On Dell machines the battery can acquire a dead short causing it to not start. Also if the memory chip/chips have gone out it will cause it not to start. If it still will not start after these three it's a motherboard problem and will most likely have to be replaced.
You can also pick up the batteries less expensive than most computer places at batteries plus. And yes it sounds as though it is the batteries charge is getting low, especially if it runs fine when the battery is out and you have it plugged in.
Check first by connecting it to an external monitor. If you see that it is the same problem in the external monitor then I think there is something wrong with your video card. See if you can re seat the video card.
This issues also come from the cable that connects the LCD with the motherboard. Have you opened the Laptop anytime and moved the cable?
Check these first. It sounds something loose or a something related to video card.