So, my mom has always been prone to computer problems, and usually I can resolve them for her. But this one has me stumped.
She’s currently using AT&T UVerse for her Internet. Ever since she’s gotten it, it hasn’t worked right. If, when you start up the computer, you immediately turn off the WiFi on the computer, everything non-network-related works fine. If you don’t turn it off, then everything (including Internet applications) works fine for an unpredictable amount of time (no more than a few minutes), and then the computer freezes up. The mouse still moves, and any “busy” animations that might be active (the rainbow pinwheel mouse cursor, or the cursor with the black-and-white spinning thing next to it, or the one in the corner of the web browser that shows that a page is still loading) continue to animate, but no progress is made in actually loading pages, and clicks on anything don’t seem to have any effect. Command-option-escape also does nothing in this state; the only way out is to power down the computer. The delay before this happens does not seem to depend on what page is being visited; indeed, it happens even if the web browser is not open at all.
When this first started happening, I noticed that the computer both had WiFi on and was also connected to the AT&T router via ethernet cable. I couldn’t find a way in the settings to get it to recognize the ethernet cable, so I unplugged it. That resolved the problem at the time, but now it’s happening again.
When it happens, the router continues to provide a WiFi signal, as tested via my phone. I still have reason to suspect that incompetent installation might have been involved, though, since when she first got the service, the bundled phone service also did not work at all (how does the installation guy even leave the house without testing that!?), and as stated, the Internet service has never worked correctly.
The computer is an aged Mac Mini running OSX 10.4 (I think that was Lion?). The web browser, if it matters, is whatever the latest version of Firefox is that can run on that OS.
Anyone have any ideas what’s causing this, or (more importantly) how to fix it?