Try to do this:
-take off your laptop´s memory and clean it,s contacts with a rubber, yes a rubber.
-test your power supply (you shoul do this first)
-take off al pcmcia cards, may be that one produces the failure
-dissarm it and test if the cpu cooling fan works propertly
-If it doesn´t work yet try with another memory module, if possible
-try without battery (only with outlet ps)
If you can´t make it work doing all this try with your technical service...
Good luck!!!