Arrrgh! I am at wits end! iMac issues.

[glinda]

April of this year, we bought a new iMac 27" 2.8GHz Intel Core/4 GB desktop. Not yet with Lion. Some remember that my "Snowball G4" finally died.

Well about a month ago, started to have small occasional issues which have now escalated. Firstly, my email jumps around or disappears. That could be our Cable Co. since we are rural but am not on dial up. Computer sometimes seems slow. I get the spinning wheel on my Safari page sometimes. My DU page does not load properly. I get a blank lower portion and if lucky can somehow get the top toolbar that lets me at least go to an occasional section. I cannot even access my "DU" to see responses.
My news pages on sites omit the photos. So if I go to Kos, I get a blank space where a pic should be.
Sometimes my programs do not shut down as the light is still under them on the dock. Two weeks ago, I had to call Apple to help me shut down Safari altogether. I tried Firefox, same thing. They gave me a trouble "number" and I called the nearest Apple Tech, 40 miles away, and they said bring it in. Well I cannot be without a computer for financial reasons!!!!!!!!!
I called the University store where we bought it and the manager who sold it to us is out sick for two weeks. They told me send a pic of another issue (ghost images seen from the side) to his email. Have heard nothing! I sent it to the tech. Have heard nothing. I do not want to lug this huge thing around all over the place. I want a new computer since someone on staff said "sounds like the motherboard". Well about the screen???????????? We bought the additional insurance too!
THe screen..... when we brought it home, a couple days later I noticed a ghost image on the right hand upper corner. Could only see it from the side. Well the two inch image has spread to five times it's size!!!!!!!!!! And now one has started on the other top corner.

Three times I turned the machine on in the morning and just get the "fan". I never can connect to the internet right away. I have to refresh pages sometimes to get anywhere. Sometimes pages just sit and load and load forever and I have to give up.
I am sooooooo sick of this. I feel like throwing the machine at the staff at Computer store.
Does anyone have a clue to why this is happening to my computer??????????????? Is it more than our Cable company???????????? Why is this happening to our screen?