To most of you out there, the above string of numbers mean nothing, to me, and the others who find this post through search engines, this is a horrible thing to see on your computer screen. but I have found a fix for it, so don't worry!
In my living room I have a machine running windows MCE 2005. I like it. After installing some patches from Microsoft and doing some minor work to the computer, It started acting funny. The TV output would flicker, so I would have to reboot the computer.
When the computer was booting, after the POST, I would get "L 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99" on the screen, and the computer would halt. What an awesome and useful error message!
I found a temporary way around the problem. During boot, I could go into the BIOS, and hit "save and exit", and I was good for one boot. But that's not a solution, that's a hack!
After looking around online, I found that the problem comes from a damaged Master Boot Record (MBR). It can be fixed by booting up from a Windows 2000, or Windows XP CD, going into the Repair Console, and running the "FIXMBR" command.
After I did that, I was able to boot up like normal. I fixed my MCE video flicker problem by updating my NVIDIA Drivers. It feels good to figure things like this out; it makes me feel like I'm actually winning, for a change.