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Laptop goes on and off

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Hello i have problem with acer laptop at first i did get blue screen at one time but it worked after restart so i left it in like month it started to shutdown randomly i tried to reinstall windows but couldnt cause laptop kept shuting down after like 5min it started to shut down after acer logo.I check charger and power with multimeter its good, i think it is graphic but idk how to test it.Anyone if u know something pls help.Sorry for terrible english any thought helps thx.
 
I alredy did it it was a lot of dust there what is intersting that i in couple of weeks back i only could statted laptop with any other key but no power button its like it was on sleep all the time only could shutdown with power button idk i usually find fault and repair it but this time its confusing thx for reply.
 
If you boot to bios does it restart?
Could be battery
Try and reset the battery - Pic attached
 

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If you boot to bios does it restart?
Could be battery
Try and reset the battery - Pic attached
Done that problem is now that i dont have time to get into bios my thoughts is that may e is that super chep i think who scan all components before start up cause laptop is on only for like 3s only acer logo shows up so i think its finding that some component dosent work properly so shutodwns but idk how to test like graphic card i dont have another laptop motherboard to test it i cant even test laptop battery on multimeter cause is sealed in black idk its a lot easier on destop comp to find mistake.btw thx for help
 
Yea its on side cause idk how to deal with it i tested power and charging port and battery but rest of comp idk how to test it i dont have spare parts for laptop my thought its graphic when i opened fan there was good amout of dust clogged so maybe got overheated prob should take out proccessor too see pins condition.its pretty
 
can you open it
Unplug battery - test with no battery

If still no good
Remove cmos battery 5 mins then replace
Sorry for bothering but i found out that if i keep clicking on keyboard laptop keep working but when i stop clicking any button it dies (i can turn on laptop only by clicking any other key but power button i can only turn off with it its like on sleep idk any ideas?
 
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