Go to the Weaknees site; they'll walk you through the decision based on which model you have.

try running it with the cover off, that would keep it cooler.

For some computers this could cause areas of the computer to run hotter, maybe much hotter. A lot of times the fans are set up to pull air out of the case, and if the cover is open the are might not flow over the areas that need cooling.

One thing to check is that there isn't a lot of dust blocking the air intakes. Also, find where the air flows out of the case and feel the temperature with your hand. If it doesn't feel hair-dryer hot, it's probably not a cooling issue.

Well, I haven't opened the case yet anyway, because I'm scared of it. Sean, your power-supply suggestion has merit; today it's run for hours trouble-free, except for shutting down twice while I was installing new printer software. I can't correlate that with other times there were problems, because I can't remember if the disk drive was working extra hard. I don't currently have any other peripherals attached, but it didn't act up like this pre-move when I did have much more hardware. Maybe it's possible the power supply has simply given out. My niece says next time she comes to visit, she'll change the power supply; that was her suggestion also. Maybe that'll fix it. It's good to be related to geeks.

I appreciate all the feedback! Maybe I can finally get this taken care of.

except for shutting down twice while I was installing new printer software.

Yeah, that would be a time when both the CD drive and the hard drive were spinning up at the same time. Make sure any new power supply you put in has as much wattage (marked on the outside of the supply) as the old one, or possibly a little more.

Okay, so while I was away this weekend the version of Firefox on my work computer stopped allowing me to open a new tab by clicking my scrollwheel. Does anyone know where I go to fix that?

I have no idea how this happened, and it's pissing. me. off.

I think that's in Tools->Options->Advanced->Tabbed Browsing.

Nope. Doesn't say anything about scroll wheels.

Is "Select new tab opened from links" checked?

Select new tabs opened from links

When you middle-click on Web links (or hold down Ctrl while clicking with the left mouse button), the links will be opened in a new tab. That tab will not be shown directly; it will be loaded in a background tab. Check this option to load the link in a foreground tab instead, which will show that tab directly.

Also, check your mouse button properties to see if the scrollwheel click is still set the way you had it.

Can't advise you how to check that without more info. My desktop machine did it the default Windows way, then I installed a Logitech mouse, which uses it's own software to configure the device, and my Sony laptop does it a different way, with different software, that co-ordinates with the mushpad.

When you middle-click on Web links (or hold down Ctrl while clicking with the left mouse button), the links will be opened in a new tab. That tab will not be shown directly; it will be loaded in a background tab. Check this option to load the link in a foreground tab instead, which will show that tab directly.

that is selected; and yet, it's not doing it. Mouse properties have the scroll wheel identified as a middle button. I don't understand! And yes, it's a Logitech mouse.

Okay, so while I was away this weekend the version of Firefox on my work computer stopped allowing me to open a new tab by clicking my scrollwheel. Does anyone know where I go to fix that?

It does that? ::clicks scroll wheel:: Neat!

Anyway, I'd advise uninstalling Firefox and delete the C:\\Program Files\\Mozilla Firefox folder (or is it a subfolder?? ::dodges ita's krav::). Reinstall Firefox and it should play nice.

Don't ask me how it got broken.