Idea centre B series turns itsself off.

Hello All,
I was wondering if anyone can help?  I have an idea centre B520 and when I turn it on it begins to startup but then turns itself off again within a few seconds.
If I turn it on again everything works but very slowly and I now have a long start up time ( twice what it was before this problem)
I wondered if there is anyone who knows why this is happening and how to solve it?
Many thanks,
Chris

Hi Chris,
Thanks for posting and welcome to the Lenovo Community,
I’d like to ask you if you can see that the machine turns off while working on the machine or it would happen only during the booting.
And please share with us if you’ve installed a new software recently that after that you can see that this problem happen with you.
Thanks and Regards,
Soha
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