Haw can I tell if my laptop's instability is caused by the power supply?

[Hamdeath]

Hi everyone,
I'm having lately graphic card crashes and low internet and I think this is caused by my power supply (it may be damaged).
So haw can I tell if my laptop's instability is caused by the power supply?
Thank you.

 

[delaro]

Check the Voltage Cold and again after it has warmed up with a multimeter.

http://www.atbatt.com/laptop-chargers/how-to-test-laptop-adapter

It should stay within 5% of the printed specs on the unit.

 

[Hamdeath]

Thank you for proposing that ... but I can't get a Volt Meter !

 

[Hamdeath]

If I run it with battery only and the crashes still happen does that mean it's not a voltage problem? because the battery can't give low voltage right?

 

[delaro]

Yes if your battery is fully charged and you still crash you have other issues like possible Overheating which is common on Laptops 2 years and older.

 

[Hamdeath]

If windows shows me this error "there is a problem with your battery so your computer might shut down suddenly", can that mean the battery isn't giving good voltage or it has nothing to do with it?

 

[delaro]

Sounds like you need a new Battery, sometimes if the battery is flaky the Laptop wont even power up. Ebay and Amazon are good places to look for a replacement if you don't want to drop to much on a OEM.

 

[Hamdeath]

The problem still happens even when I remove the battery...
Anyway thank you for helping

 

[Hamdeath]

I just finished trying the method you told me (with my friend's voltmetre) and it's fine I don't know what the problem with the laptop :/

 

[delaro]

Check your heat, the CPU or GPU might be Throttling due to overheating.

Real Temp it will give Time Stamps when temps Changes.
http://www.techpowerup.com/realtemp/

 

[Hamdeath]

I checked GPU and CPU heat and it's OK. I think this is a software bug because I just finished installing a new game and I played it for 30mn without problems !

 

[Hamdeath]

I tried re-installing one of the games that used to crash and now it's fine. It was a software bug after all.
Thank you for the help.