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Here's what you can try.
1. Remove the battery and try turning the laptop just from AC adapter. Maybe the battery is bad and shorting the system.
2. Try turning it on just on battery power (with AC adapter removed). Maybe the AC adapter is bad and shorting the system.
3. Try removing memory modules one by one. Maybe your failure somehow
related to memory. Test the laptop with only one memory module
installed. Try either one.
If nothing helps, the laptop still turns on and off by itself, most likely this is motherboard related failure.
dont they all , eventually. all do a fact. but why ? so leave that old battery out, run on AC for ever if you wish and for SURE TESTING. they love to fail and overload the PC. so with AC good power pack no main battery does the power turn on? y/n does the fan run (above is yes) does the cd tray eject does the bios message show on the screen, it must "hit f10 to setup?" means BIOS page. does it, or is the screen back totally no text EVER. even hitting the F10 key or the key it told you to hit for 10 years. that is called fan running and not packed up. the black screen of *****. we have no idea what YOU can do, your skills your tools, ? how can any person know that. if not black screens of deathh then say so and say what you saw fully this time. http://pcdied.com/black-screen.html its a nx9020 (2004, 13 long hard years old.!!!) not 9020, the nx matters . big time top black screens fan ok are? COIN cell dead. CMOS RTC battery coin main battery shorted, nah its parked on shelf. CCFL lamps it PC are dead. as all are this old do the flash light trick yet, fan blowing.
remove all attached devices like printers or flash drives. remove battery and power on using ac adapter only. if it still wont work, try another good ac adapter. make sure ac adapter light is on. if it still shows the power light on and nothing else, replace motherboard.
Try taking out battery and plug in power. If it works, battery is faulty. If not, try taking out your hard disk plug in power, if it works, hard disk is faulty.Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.
Note: If machine is under warranty no need to pay for the repairs.
I am facing a similar problem with 5160 and my power button will not power up the laptop. I presses the shift key, it got powered up (offcourse only fan started but the screen is black)
Try pressing shift key to power up.
Try removing the battery with the AC unplug for a couple of minutes (an hour preferably).
Try with just the AC adapter only with no battery and see if it works; try with the battery only and see if it works, try with both the battery and the AC adapter and see if it works.
If none of the above will make it work, then you have probably a hardware issue or BIOS power saving issue.
Post back results of the 3 tries and will figure something else.
Good luck and kind regards.