Mac pro start up trouble , 5 important questions!!

I went on a 2 week holiday where my mac pro dual core was unplugged. When I got back and started the system it would go to the desktop screen but would then either freeze or I would get red lines across the display. I would have to manually shut it down and restart till it worked normally.
So far I have reset the SMC, the PRAM/Nvram, I have replaced the computer battery, run Norton Anitvirus, run a apple Hardware test (it came back fine) I have run Disk Warrior and Tech Tools Pro 5 and I have done an OS X archive and install and nothing has changed.
Although today the first 2 times I turned it on there was no start up chime/black screen and it took 5 manual restarts to work!
Question 1: Should I do a fresh install?
Question 2: Trouble with the first question is that my Super Duper copy was made after the problem started - won't the problem just be transferred?
Question 3: Does migration assistant transfer my copy to my hard drive if I do a fresh install?
Question 4: What should I do? - Should I pay for it to be fixed?
Any help is appreciated!!

Thank you for the reply.
Can I ask a few questions as I'm slightly new to computers. I didn't quite get the freshly formatted new drive stuff.
In my mac pro I have the mac hd with an additional hd and I have one external drive which is my backup (I need to get another one).
Q1. Unfortunately my backup was made after way the trouble started so a fresh install and migrate won't help will it?
Q2. Because of this I was thinking of doing a fresh install then just transferring over the music and photos and downloading the software again - would this help?
Q3. Because of this, I own final cut studio 2 which was then stolen from me, can I just transfer this from my backup (if so how?)
Q4. How come you recommend uninstalling Norton Anti Virus?
Q5. If I do a fresh install should I remove my second hd until its done?
I tried the overnight trick with no luck.
Thanking you in advance

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