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Could be a Boot Loop. This happens when you have (or attempted to) modify the device's firmware. A factory reset would be the best solution to your problem.
First you'll have to power off the system.
Please power on the system and as soon as you see the Dell logo please tap the F2 button 3 - 4 times.
The computer will go to the system setup. Check if the screen goes blank here.
If the screen stays on then try this.
1. Please power off the system.
2. Please power on the system and as soon as you see the Dell logo please tap the F8 button 3 - 4 times. You'll reach the Windows Advanced Boot Options Menu on the screen.
3.Select Safe mode with Networking.
4. Select Administrator at the log in screen.
5. Warning dialog box with the message Windows is running in safe mode. appears. Click the Yes button.
6. The desktop appears with the words Safe Mode appearing in all four corners.
7. Uninstall the video drivers and restart the computer.
8. Resintall the video drivers.
With no more information that what you have provided I would start by reseating the memory and video card if you're not using onboard video. Then I would check the hard drive via chkdsk, run it from a command prompt. If the drive seems ok the next thing I would do is reinstall the OS. If it still gives you trouble after that you have a faulty component (memory, processor, power supply, video card, or mother board) and I would start swapping in known good components.
This problem was resolved with the latest release of the Android OS (RC30 in the USA). You can download this update and install it manually, or you can wait until T-Mobile send it to your device as an OTA update.
Try looking on the back of the machine for vertical and or horizontal hold controls (marked V-Hold and H-Hold) and try adjusting them, especially the horizontal hold.
If that doesn't help, then the next troubleshooting step would be if the machine has a video output you could try connecting to a TV/Monitor and see if the graphics appear there.
It is normal for VIDEO 3 to be displayed in the upper left of the picture if there is no signal present at the INPUT 3 jacks. This is to let you know that although the picture is black and there is no sound, the TV is still on. If you have a good signal at INPUT 3 and the VIDEO 3 stays on the screen, take the Sony remote, point it at the TV and press the DISPLAY button until you see "DISPLAY OFF" on the screen. About 3 seconds later, the words should vanish.
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