I’ve had mine for 3 years now, and I think I have this machine figured out.
As most owners of this machine, I’ve had my motherboard replaced because of some design flaw that caused it to overheat.
Here’s one very good page that discusses how to replace the thermal grease on the 1100, the 5100 and the 5150: http://www.danandsherree.com/2005/04/02/our_dell_inspiron_11.phpÂ
I performed this procedure on both my and Bro Taguchi’s 5150. (Yes, we have the same computer. He bought his on my advice. Doh.) I think my computer is running more coolly now. In fact, with a bunch of other tweaks, it’s running the best it ever has.
I also am using Speedswitch XP and I8kfanGUI, which can be found here. I put those programs on Taguchi’s computer, but it was still running hot. I thought it might have been the processor switching back and forth between its battery mode and its ACDC mode, but it wasn’t switching. It would just stick in high gear, so to speak.
In the name of science, I turned off Hyperthreading (Restart your computer. press F2 during the Dell BIOS screen to enter the BIOS. Press ALT+P until you hit a screen with Hyperthreading and Speedstep options.) It allowed the computer to switch gears and thus to cool off. It cooled off a lot–about 20 degrees–and the fan noise went down.
When I turned Hyperthreading back on, the temp went back up. Boo.
Some people have turned off Speedstep, but it looks like in this case, anyway, Hyperthreading was the culprit.
Enjoy.
–Agent Spanky McGee
