I’m having a recent issue with my XPS B system. I recently installed a 4 port USB 2.0 card in the machine, and everything works fine.
Yesterday, I had cause to bring the machine down for a while. From its shutdown state, when I plugged it back in and hit the power button, it ‘revved’ for a second and then shut down again.
I pressed the power button again. Same thing. You can hear the fans spin up and then shut down. Pressing the power button continuously in a rapid fashion (revving) gets it to the post area where it becomes stable and continues to boot. There are no other problems than this.
It seems like a really odd thing… reboot works fine, machine runs fine, it just won’t rise from a total shutdown gracefully.