My T21 laptop boots ok but after running for a while shuts down.
I am not sure what is causing this, I removed battery and ran without with same results.
I was able to run a diagnostic on the computer and all systems passed.
Fan is running as air is comming out of the fan holes on the side of unit.
Any suggestions. Thanks
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does it overheat? try removingthe battery on the laptop use the adaptor only then power your system without the battery, check if the system will power on properly without it shutting down if the sytem runs perferctly without thw battery you'll need to have the system checked possibly the battery causing a small glitch on the motherboar or the motherboard is having issue with the power distribution with the battery connected to it either way this is going to fall in the process of elimination to find out which hardware is causing the system to shut down also check if the fan is spinning, if the system is overheating and the fan is not spinning the system will really shutdown instantanous after powering it up of it maty power but not even boot in widnows.....
call your OEM original equipment manufacturer ask if you still have warranty if you do its best that you have it repaired with them to be sure that it will be repaired by trained technican spefici for your laptop brand ^_^
Can you tell if your AC power cord is working? (Is there a light on the computer that comes on when it's charging?) If the power pack went dead, your battery could've died and now you get no power to the PC which is why it won't boot up.
To test, take out the battery and plug the AC cord in and try to boot up. If nothing at all happens without the battery, then your power cord or power pack is dead, and you just need to replace it.
Apparently, either the AC adapter isn't compatible (check the voltages and power ratings) or you have a battery charger issue. If you're sure the adapter is OK, then the battery might wrongly report a full charge at a higher voltage than the AC adapter.
So when the battery is plugged in, it will always preempt the AC adapter - possibly even shutting it down - except that, having almost no power left, it will also force the computer itself to shut down.
What might have happened is that the faulty AC adapter actually damaged the battery. I'd suggest checking with another battery if any is available, and not to use both together lest the battery now damage the new adapter. But first of all, check the power ratings and polarity on the adapter against the old one and whatever is indicated (usually) on the PC underside, just to be sure.
OK, i experience this before, i think your situation is mostly like mine, and this problem may cause by the your laptop power adapter, please replace a new adapter and see how is the result. Hope this help.
Does the battery get very hot? If so try running the laptop with it removed! This problem might also caused by a faulty heat sensor on the motherboard. Given the current cost of new laptops I wouldn't spend a lot of money on any repair options, but you could invest in a "laptop cooler" or chill mat see this link http://www.quadcooler.com/
Old Sony laptops do this when the battery is dead, or the charging system is below required voltage. A battery with a dead cell (which this sounds like) can damage your external PSU and internal battery/power regulator circuit. Remove the battery (shut down and disconnect PSU first). You can run the laptop forever, without the battery, if you cannot find a battery replacement, or do not like the cost. Obviously, though, the laptop will not run at all without the AC/PSU connected when the battery is removed.
Boot up the system (without the battery). When the system runs normaly then place the battery on its normal bay.
Shut down bij removing the power from the system.
* Make sure you have not installed any Windows power saving tools, meaning let it run on the battery till it dies * Wait till the systems shuts down by itself. Boot your system again (with the battery in its bay and everything will work out fine. Shuting down by removing the power support (AC) booting up AND your keyboard with touchpad will work again.
So intill you have a new battery, you need to shut-down by removing the AC power and leave the battery in its bay. You can not shut-down on the normal way any more untill you have replaced the battery.
I had a similar problem after My pc got damp in a bag in the rain. I contacted IBM and was given this fix which I am supprised worked but it did so here it is cannot hurt to try. Remove the main battery and the mains power supply press the power on button for 17 seconds. This I think is to drain all the power from the laptop altogether. Replace the mains lead and turn on. Once the laptop has openen up into windows turn it off and replace the mains battery then power on again. In my case this worked I hope this helps.
This could be an indicator of one of two things:
1. Bad motherboard
2. Short circuit.
If you can, disconnect the CD-Rom drive, hard-drive AND the keyboard if possible.
If you turn the laptop upside down you can normally see the screws relating to each of these components. Do one at a time and test to eliminate them.