My Satellite laptop (A305) shuts down when run on the AC charger/adapter

The problem is that my Toshiba _A300 series laptop (A305) shuts down when you try to run it on the AC charger/adapter_. You can boot it with the power cord plugged in and it will get to Windows Desktop and maybe a few minutes more at most before shutting off.
It will boot and _run from battery without problem_, but if you plug in the AC while it is up and running on battery the machine will normally click off instantly and reboot to the message "Windows was not shut down correctly."
The _AC adapter works fine_ reading a steady 19.19 to 19.20 volts with a voltmeter. It also _charges the battery fine when the computer is off_. I have two Toshiba brand batteries and they both work fine.
One interesting thing is that the _computer runs fine on AC when in safe mode_.
I _did a reformat/factory restore_ of Vista to assure it was not software and drivers, and still got the same problem before any external devices had been plugged in.
It has the latest BIOS and I tried resetting it to default values in case anything had gotten changed. It made no difference.
This is _not a heating issue_ because _while it is run on battery I can watch long videos_ without it shutting off. I ran compressed air through the vents just to make sure, but it makes no difference in behavior. Usually with an overheating shut-off, the computer cannot be started until it has cooled some, but these shutdowns are accompanied by an instant reboot.
I have seen on some threads that this type of problem one can work around by disabling one of the processors in Device Manager, but I don't think that is much of a lasting solution or good for the computer.
Has anyone seen this problem before and have you come with a full diagnosis of the problem and a real solution?

I have Satellite A300 and until now everything works OK.
I would like to know what happen when you remove the battery and use notebook with power supply only. Does notebook shuts down again.
If not let OS run and put the battery.
Is the battery recognized properly? Does notebook switch off again?
To be honest I cannot imagine this issue has something with software or background processes. Recovery image you got with your notebook is designed for this certain notebook mode. Recovery image is tested and I dont think preinstalled OS has anything to do with this.
Full diagnosis?
And how to do this? You know very well that diagnosis can be done with diagnostic tools only and such tools have services only. I hope you will find answers but Im 99% sure there is nothing you can do about that. Maybe you should contact service, explain the situation and ask for help.

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Im have the late Macbook Pro 15" and I have had it for a year now. When im running my macbook off the battery it shuts down... I have no clue why. It started doing this about 4 or 5 days ago. I have my battery info here.
Battery Information:
Model Information:
Serial Number: Sony-ASMB012-3916-d74e
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 2828
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 2914
Health Information:
Cycle count: 65
Condition: Check Battery
Battery Installed: Yes
Amperage (mA): -544
Voltage (mV): 12137
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 20
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 5
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
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I am having the same problem. I just recently noticed that my battery life was less than an hour. In the beginning, I was able to watch 3-4 complete movies while on a flight. Now, it shuts down if on batteries within 10 minutes while the Bar shows 59 minutes.
Here is my System Profiler
Battery Information:
Model Information:
Serial Number: Sony-ASMB012-3887-4d
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
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Fully charged: No
Charging: Yes
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Condition: Check Battery
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Amperage (mA): 121
Voltage (mV): 12275
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AC Power:
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Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 20
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Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 5
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: Yes
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