Laptop won't power up

Robert Ehinger
Robert Ehinger used Ask the Experts™
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Sony Vaio VGN-NR240E laptop. The battery died and the computer wouldn't start. I had read somewhere that you cold remove the battery and the power cord, hold the power button for about 30 seconds and then plug the power cord in and the computer would release "residual energy" and would boot. This worked for a while but now I get two lights to come on briefly and then they go off and no Windows boot. If I make another attempt to power it up without first removing the power cord and holding the start button nothing happens. After holding the power button and then plugging the cord back in I will again get the two lights. I have tried two different power cords with the same result. Please advise.

Thank you!!

Robert
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DavidPresident
Top Expert 2010

Commented:
"Residual energy?"  The technical term is capacitance.  Just replace the battery, and unless you have some other problem, you should be fine.
Robert EhingerIT specialist

Author

Commented:
I have a battery ordered so I will let you know if that solves the problem.
Gerwin Jansen, EE MVETopic Advisor
Most Valuable Expert 2016

Commented:
Hello Robert, did you remove the battery from the laptop, connect the power chord and then try to boot it?
Disconnect the AC power, remove the Battery pack, remove and clean the golden edge of each Memory stick with a soft white rubber/eraser, remembering not to touch the golden edge of the Memory stick.  Re-insert one stick at a time to test. Re-insert the AC adapter and see if it will power on. Instructions for removeing the Ram can be found here. The guide covers several models.

http://www.retrevo.com/support/Sony-VGN-NR310E-Laptops-manual/id/23014bh440/t/2/
Top Expert 2013

Commented:
the fact that you neeeded to "bleed" the residual charge indicates some problem already; probably from bad capacitors
it may come from any device, so the best troubleshooting is eliminating devices  imo

here my laptop troubleshooting guide, i hope it helps you :
- remove all external devices
- if no display - test with an external monitor
- test if it runs from battery alone, or from AC alone
- test also with a known good battery !
***some laptops have a reset button - if you have one use it!
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
- if NO remove all ram and reboot --> if NO beeps, mobo or cpu bad ; if it beeps, replace ram stick
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !

you can also remove and reseat the video plug - it sometimes comes loose
Robert EhingerIT specialist

Author

Commented:
So far, by removing one RAM module the laptop is booting o Windows. I have new RAM ordered so we will see if that resolves the problem.
Gerwin Jansen, EE MVETopic Advisor
Most Valuable Expert 2016

Commented:
>> I have new RAM ordered so we will see if that resolves the problem
This is good news, I'd recommend that you test the (remaining) memory as well using memtest86, it's on a bootable CD, like memtest86 or ultimatebootcd.

By testing you'll make sure that your notebook will work until your replacement module has arrived. Also: think about making a backup of files that are important to you, now the system is working again. I'd make backup before testing the memory btw.

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