Inspiron 17 7447 8 Beep Display wont turn on.

So yesterday i woke up and turn on my laptop but the display won't turn on (my mouse light and my laptop light did turn on),after a few hours of research i know that it a display error, im still new to the PC world but i know a thing or two.So i un screw the bottom pastic thing that hold the ram and the hhd (or hdd i forgot sorry) check each single ram to see if it's my ram (just to make sure) and i disconnect the hdd to make sure also. After all that it still beeps 8 times. After that i see a Utube video about my problem it says press D and the power button at the same time so i did it my laptop pops up a few colors red,green and blue then it just turn off my display and keep beeping

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hemanlam123 8 Beeps is usually a LCD or cable failure. Try this first :

"If the LCD on the system does not show any display, here are some basic steps that you can perform:

Remove the battery and AC Adapter from the laptop and press the power button down for about 10-15 seconds to release flea power.

Power up the system and then press the F12 key during the boot process to get to the Boot Menu, if you are able to see the display.

It may be necessary to repeatedly press the key during the start-up process.

Use the up and down arrow keys to select <Diagnostics> on the menu and press the Enter key.

Or

Hold down the Fn (function) key

Power on the notebook

You should then see the Dell logo screen with the message 'Diagnostic boot selected' in the top corner.

You can then release the keys

While the LCD BIST test runs, the LCD is operating on its own, free of the video controller, which may be discrete (a video card) or on board (on the system board). The test allows you to distinguish an LCD panel problem from a problem with the controller. If the colors are displayed across the screen without a problem, then the issue is not with the LCD." from here.

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