Lenovo t520 - won't power up

I get 4 lights for a few seconds

Caps lock
Blue tooth
Hard drive activity
Power on light button itself

Then it powers off by itself :-(

My laptop

I've removed battery
Held down the power button for 10 seconds

Swapped memory
feck1Asked:
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nobusConnect With a Mentor Commented:
here my laptop troubleshooting guide, i hope it helps you :
- remove all external devices
-you can disable devices from BIOS to test (sound, lan, etc..)
- 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 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 test if the mobo works outside the casing, connected to power and external video  !

you can also remove and reseat the video plug - it sometimes comes loose
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JohnBusiness Consultant (Owner)Commented:
It appears the CPU is a problem (powers itself off) or it is overheating. Try cleaning the air vents.

If no to the above then you need to get it serviced.
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KimputerCommented:
Most likely back to seller or Lenovo if still under warranty. Suspect motherboard issue (overheating/cpu/fan problems, usually it will take longer than a few seconds before turning off). Seems you've don't the most you can already do.
Not sure what you mean with "removed battery" though. Did you put it back and start it again? You should try to start the laptop without the battery inserted.
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feck1Author Commented:
Have tried everything inc removing the
Memory / swapping battery .... With and without battery
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feck1Author Commented:
Laptop is dying :-(
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JohnBusiness Consultant (Owner)Commented:
Please get the machine serviced as it needs perhaps motherboard or CPU.
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JohnBusiness Consultant (Owner)Commented:
A T520 is decently new so it can be repaired.
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feck1Author Commented:
I
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feck1Author Commented:
I
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feck1Author Commented:
It's oow out of warranty
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JohnBusiness Consultant (Owner)Commented:
It is still probably worth getting repaired, but that is a choice you need to make.
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KimputerCommented:
The choice is probably 200-300 bucks for a repair (and hope it has a long life after), or spend double, for a brand new one (faster, new full warranty).
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JohnBusiness Consultant (Owner)Commented:
Did the multi-point guide supplied above give you a solution that got the machine running?
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