Don't take your agression out on equipment -- eventually, you'll do something really costly, and the guilt that results is so not worth it.

Instead, keep something you can strangle, smash, punch, whatever near your workspace. I have a "problem penguin" at my work desk. I explain problems to the penguin before asking questions, but I also throw him at my whiteboard or wring his neck when I get truly frustrated. It helps.

Then again, so does playing a few rounds of Stair Dismount. ;-)