if you are using on a desk try a laptop cooler, bought one for my eldest, plugs into a spare usb port also has got another usb on it so in effect you dont lose one. Would sort out the linkbut just too darn lazy!
Call HP and ask them if there is "A service note for hot running 7000's" If it is a common fault there will be a service note and that means you will get a FREE repair. 0906 477 0 477 60p p/m for Out Of Warranty. 0870 010 4320 8p p/m forIn-Warranty. Mon-Fri 8.30-18.00
Now, if you call the wrong number and say you called the other one and it was 'broke' or something, they might put you through, cheap ;)
Just don't tell them I told you 'cause I used to manage that call centre.