My M1210 stopped working. Wont boot up I get no

Try these steps

http://www.fixya.com/support/r3581893-how_to_troublehoot_a_portable_compouter_

I had this problem too with my M1210. The first time it was under warranty, and I had the Dell people come out. They ended up doing this simple fix:

Remove the battery
Hold the power button down for several seconds, then release
remove the power cord
Hold the power down and insert the power cord (keep holding button)

This worked for me the second time it happened, 2 years later (i.e. tonight). I came here trying to find the exact sequence of steps, but since they weren't here I had to just peform random button presses until I remembered how to do it. I hope this works for you.