Screen not working properly, changing colour and making noise.

If the component cables are to connect your television and they are not correctly connected, this can cause a greenish colour picture to occur on the screen of the TV . A high colour tint setting will generally create a green image on the TV's screen where as a low tint will create a more red hue then. The buzzing could be coming from the cables not being properly connected to the TV.

Sounds like it needs to be sent in for warranty service.

if you are using the computer then you have to change the vga cable

Click start control panel display desktop you can select a different desktop from the drop down list or a browse button where you can select different pictures this may vary depending on your operating system. also you can change the settings for more or less pixels or from the drop down list pick the appropriate level of colour range or troubleshoot also select advanced then general dpi Normal , Larger or Custom settings.
always click APPLY after making any changes
windows 7 Open Personalization by clicking the Start button, clicking Control Panel, clicking Appearance and Personalization, and then clicking Personalization. Click Window Colour and Appearance. Under Window Colour and Appearance, click the colour you want, and then click OK. Note If you see the Appearance Settings dialog box instead of the Window Colour and Appearance window, the theme might not be set to Windows Vista, the colour scheme might not be set to Windows Aero, or the computer might not meet the minimum hardware requirements for running Windows Aero. For more information, see Troubleshoot problems with Windows Aero. Hope this helps.

press windows key + R together... type devmgmt.msc and click ok... you will see device manager... go to display adapter (double click) and make sure the device status is working properly... in the device manager you should not have question mark for any of the devices, if you have question or exclamation mark then it says that particular device  is not working properly...you need to install the drivers for that device to make it work good...

The colour changing and dare i say it...vibration is the connection between the phone and the back. as you may know the n79 has chip in the back cover to tell the phone which colour to make the screen to match. Mine did this for months and months and then I changed the back and everything has been fine since then! Well apart from the fact that it crashes twice a day when i turn the keypad lock off and somehow i've smashed the lcd screen, but other than that all good!

you have convergence problems there are ics that need to be changed and possibly some resistors on the pwr supply deflection bd

D3mon,
Looking at the photo that you took... You've defintely got a damaged panel. My advised get a new one...saved you the headached and $$$....

Sounds like the drop damaged the screen. To check this, connect it to an external monitor. If everything works properly, then the screen is damaged and will need replaced. If it doesn't work properly, then a motherboard component has been damaged, and you will most likely want to take it in to have a professional diagnostics done.

It could be a bad connection in the wiring between your display and the keypad. You should get it checked out at a cell phone store especially if it's still covered under warranty.