I have never heard the name "ATI Radeon Mobility 250". It could be an ATI Radeon Mobility 9000, which has a rv250 chip in it. I have the same in my old laptop, the tests run without crashing(Some are failing due to clear driver bugs though, and I there aren't any newer laptop drivers available)
That's the one. The system doesn't blue screen. The display has a yellow background, with a four-color square in the middle. The mouse pointer is an hourglass. The mouse pointer moves around, but the system doesn't respond to ctrl-alt-del or ctrl-shift-esc or alt-tab, so after half an hour of no change I power cycled.
The d3d9 tests crashed for me, so it was some test after that. I assume it's a some d3d or ddraw test because the screen resolution is different than the default. --Juan