yrag: Not in browser. The PC screen just flashes as if the video drivers were going crazy. I guess the best way to describe it is it looks like someone taking a picture of my screen from the inside.
Lightstar: minde doesn't go black, it just flickers, flashes.
Wizard: not sure about a UPS, I don't have one on my PC as it's connected to the plugs built in to my cubicle where there are 6 PCs connected but doesn't mean there isn't one for my row. It's possible, however I have seen individual UPS's in some cubicles around me. No speakers on my desktop, only headphones and the speaker built into the PC case. It's a Dell PC with XP.
Kitkun: Flash, like a picture flash. Or flicker.
Uvah: I guess it is a cool avatar, can't see the whole thing though thanks to JU's style of showing enlarged versions in the comments where you can only see a piece of it.