This is where you'll learn that a dual boot is a must, in all honesty Linux does not have an extensive list of user friendly tools or applications, don't get me wrong all of the tools you'll find for any job are in the Synaptic Package Manager(don't forget to read up on repository's and how to enable them) most of the open source applications take a little command line knowledge to get working at the worst of times and for video editing there are not a whole lot of options whereas in Windows there are countless.
Use Firestarter to manage your firewall(or if your bored look into iptables)
Remember any tools you use has a help file alongside it, to use it for firestarter open a terminal and type man firestarter.
All in all Linux is best as server, so if you wnat to host a media server for you other machines on your network XBMC(X-box media center) is a good choice.
To find any software search through Synaptic Package Manager and it usually turns up a lot of interesting results.
As I said Windows is best at some things and Linux is best at others, if you come to not like it as an everyday OS you'll learn the power of it's networking capabilities and keep Ubuntu as one big tool
I've had a quick look around Asus forums for you and there are at least a dozen threads of people complaining of their Asus screens dieing. There are three sides to it
1.) Nvidia have acknowledged that large quantities of the 8 series GPU's are defective, check whats in yours
2.) people on the Asus forums are saying there is a standby/hibernation problem with the screen and it will not light up, fix is to remove the battery( I know your problem seems to be more serious)
3.) Like you people are also complaining that their GPU's or motherboards are failing and as far as i looked I did not see one reply from an Asus rep to any of them.
It's a pity the warranty is gone mate
...sorry to say that it looks like you may be kind of screwed.