weird t41 bootup problem

[scottiecargo]

my t41 will only boot up with the battery in, but not the ac adapter plugged in. if i try to boot with the ac adapter plugged in and the battery together it just powers on but blank screen.... also if i take the battery out and power it on with just the ac power cord ,lights just blink... so basically if i power on with out battery in (no startup) lights just blinks and i can hear fan... but when i power on laptop without power cord and just battery (it powers on easy) i need help

[Neil]

That is weird. I have found that most, but certainly not all, weirdness on these T4x machines is due to SouthBridge and/or GPU BGA failure. You might go through the usually procedure for checking those things, and if that doesn't isolate the problem, they could still be at fault.

[scottiecargo]

thanks neil

[osocha]

Did you solve the problem?

I have exactly the same issue.
T41 starts on battery with power supply plugged off.
When power supply is plugged-in (with or w/o battery) it doesn't start.

What is standard procedure to isolate SouthBridge and/or GPU issue?