Question Laptop turns on and off in different times

Jul 13, 2019
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Hi,

Sorry if this is not the right place, first post.

So, i have an old acer 5740 laptop, and it started having a weird problem, and so we stopped using it, but now i decided to fix it.
The thing is, it keeps turning on and off, details:
I've formated the HDD, so no windows installed.
When i try to install windows 7 trough USB it will work for like 30 sec and then reboot stopping the windows install and starting over.
I've already tested removing RAM, only 1 stick, both, ...
With battery, without battery...
If i boot without the usb, it says "no operating system" but dont reboot, just keeps this way!
Sometimes it will not boot, or will boot but for 1 sec, and then again again...

If anyone have any idea i will try!
 

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