When i try to turn on my android tablet the screen turns on but stays black then it shuts off

Try a Hard Reset.

Hard Reset COBY Kyros MID9742, how to - HardReset.info

https://www.hardreset.info > devices > coby-kyros-mid...
The following tutorial shows all method of master reset COBY Kyros MID9742. Check out how to accomplish hard reset by hardware keys and Android 4.0 Ice Cream ...

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  Factory Reset COBY Kyros MID9742, how to - HardReset.info

  https://www.hardreset.info > devices > hardreset-second...
  HardReset COBY Kyros MID9742; To enter the Recovery Mode hold down the Power key for a short while. Remove Screen Lock on COBY Kyros MID9742; From the menu ...

COBY Kyros MID9742 Hard Reset - HardReset99

https://www.hardreset99.com > coby-mobile > coby-ky...
27 Feb 2017 - Volume down + Volume up + Power button For a while. Please try above all steps one by one, Until you will see Android reboot or fast boot menu.

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Hi Queenfrog, The link below is a youtube video showing you how to fix your tablet, There's video's down the right side you can check out as well....CHEERS..
https://www.youtube.com/watch?v=0PAB6khykWE
How To fix any Android Phone Tablet that won turn on

factory reset tablet wont go to the home screen

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www.howtogeek.com/.../what-to-do-when-your-android-phone-or-tablet...

May 16, 2015 - android wont turn on. You turn on your Android phone or tablet by pressing its power button - simple. If that button won't work, your device isn't necessarily broken ... often see an "empty battery" indicator on the screen when you try to turn it on. ... You should only have to hold the Power button down for ten ...

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3 days ago - 43 posts - ‎36 authors

Try a factory reset of your tablet first. Here is a link to the procedure:
http://www.rcatablets.com/how-completely-reset-your-rca-android-42-tablet

How were you cleaning the screen?

So, now you've become a robot.. Throw it in the river and buy fishing pole.

Hi,
PRess and hold the volume up button and then power button together for a few seconds

arnova 7 g2 has no volume button..