Thinkpad R50e !!!!HELP!!!!!

[uzzy316]

I have Thinkpad R50e laptop which is not starting up .Sometime the power LED gives a blink and then its dead; even if it starts for few min it will suddenly die.

When I put the power lead at the back of the laptop the battery LED will sometime come on but showing green but not yellow as it should. But then no LED will show just dead.

Please help

[truk]

Try booting without a battery, with only a battery and no adapter, and, if you can, with a different battery that has already been charged on a different computer and no adapter.