Turns off autometically

O.K. Let's start by checking a few things that commonly cause this. First check the power supply with an ohm meter for the proper output, and check the jack on the machine. If the supply is starving the machine, or the jack is loose/broken it could cause this. Then pull the battery, and try starting with the supply only. It could be a bad battery or engaged battery fail safe. Then remove the memory, and try each chip one at a time in each slot. Could have a failing memory chip. Now, follow the link bellow and download the drivers for the power management system, battery,and anything else that may be relevant to the shutdown, definitely the power management and battery downloads. At this point, you've done all that you can do without getting professional help. If the problem persists, then it's going to be a failed motherboard component, most likely with the power management system. You can take it in for diagnostics,but in my experience from the Thinkpad's that have come through my shop, it's cheaper to replace the motherboard than it is to try to have the power management system repaired.



http://www.ibm.com/products/finder/us/fi...& O.K. Let's start by checking a few things that commonly cause this. First check the power supply with an ohm meter for the proper output, and check the jack on the machine. If the supply is starving the machine, or the jack is loose/broken it could cause this. Then pull the battery, and try starting with the supply only. It could be a bad battery or engaged battery fail safe. Then remove the memory, and try each chip one at a time in each slot. Could have a failing memory chip. Now, follow the link bellow and download the drivers for the power management system, battery,and anything else that may be relevant to the shutdown, definitely the power management and battery downloads. At this point, you've done all that you can do without getting professional help. If the problem persists, then it's going to be a failed motherboard component, most likely with the power management system. You can take it in for diagnostics,but in my experience from the Thinkpad's that have come through my shop, it's cheaper to replace the motherboard than it is to try to have the power management system repaired.

http://www.ibm.com/products/finder/us/finders?pg=ddfinder&Ntt=ThinkPad+T42&lc=en&sid=027895111219853009341&tmpl=%2Fproducts%2Ffinder%2Fus%2Fen%2Ffinders&Ntk=text_gensearch&cm_re=other-_-suprcn-_-download&N=1000367&collectionN=0&cc=us&finderN=1000188&