When your computer freezes/hangs/stalls, stays on same screen, input devices don't work - how do you say that? 我的电脑。。。

冻结

失速

卡住

？

Also got - 死机了 and 当机 from another board. Any others?
The most common one should be 死机了, you can also say:

死了
不动了
没反应了
黑屏了 (got a black screen)
蓝屏了 (got a MS Windows blue error screen)