Hi I've one of the Dell XPS M1330 machines that come shipped with Hardy LTS (Dual Core T7300 2GHz/800Mhz 4MB Cache, 2GB RAM). I've had it for a year and use it for scientific computing. As of about 2 weeks ago I notice that the my youtube and BBC iplayer playback started becoming jerky after a few minutes into any video. I've not made any software changes recently. I ran the usual DELL hardware checks and reinstalled my flash plugins, without improvement. My laptop began freezing, including with standard applications like openoffice or when running a CPU intensive job during analysis (I code in R). So the problem appears to be my CPUs and I've confirmed, using the system monitor, that they rapidly hit 100% before my laptop freezes. I see there are some CPU tests out there, but have never tinkered/tested with any CPUs before. I prize this machine (a lot) and have heard horror stories around naive CPU testing. This has become a real problem for me - I use this machine 10+ hours a day - so any advice on what I should do next (explained to me like I'm an idiot) and what the problem is likely to be would be very, very, very welcome! Thanks a stack, Quin