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The screen can be inadvertently be switched of by pushing the wrong button, are you sure it isn't this that has happened. I think it is the f5 button that does this, please check this first before proceeding further
do you mean that on the windows of the programs you are running are not there such as minimize maximize and close? check what is taking up your cpu by right-clicking on the taskbar and selecting task manager, then going to processes. Find out what is taking up all your resources. or switch to a different operating system besides windows.
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
You can close your browser window by clicking on the red "x" in the top right hand side corner of your screen. The red "x" means "close". The "square" in the center next to the "x" means make "bigger". The - key next to the square in the upper righ hand side corner of your screen means "minimize". "Minimize" means bring the window to the bottom of the screen. It's like tucking it away or hiding it. If your window is full size and you click the minimize button, it will make the screen a smaller square in the center of your monitor. If you click it again, it hides the window at the bottom of your screen. You can see which windows re open by reading the labels at the bottom of your screen. To bring a screen back up to regular size when its minimized on the bottom - just click on it with your mouse.
turn off laptop. press and hold on the D then press Power button. during the LCD BIST test check if the black line down right side of the screen is visible. if yes LCD needs to be replaced. if not connect your laptop to an external monitor check if the black line display appears to the ext monitor, if yes uninstall / reinstall video driver if fails replace video card or if it is built in replace motherboard.
if no ext monitor available then run PSA (press and hold Fn key then press Power button)
check if the black line is visible. Check also in BIOS is black line is visible, if yes then uninstall reinstall first the video driver if fails replace LCD.
It is one of three things usually Bad cable at the hinge, Failed inverter board, or failed backlight. Probably inverter. Not to difficult to repair. Check cable first because it is inexpensive and easy. Check the inverter and replace if needed . Sometimes you can buy one used cheap with a bad motherboard and swap the top.
Well it is most likely a issue with the Video driver as you are able to boot to the safe mode.I would suggest going back to the safe mode and deleting the present driver for the video from the device manager.before you restart the system just download the latest version from the support.dell.com so that you can reinstall it.Also check in the graphic properties which screen is set to be the defuat.Incase still not working i would suggest reinstalling the operating system before replacing any hardware.
black screen at startup? do you still see the Dell logo at startup? try pressing Fn+F8 at the same time at the black screen and see if it works. Or else, try a working external monitor and check if its a OS problem or a screen problem. You can also run a diagnostic test by holding down the Fn key while its off and then press the power button while still pressing on the function key to check if you will still see the diagnostic test for the LCD.