How can i fix this, i cant even turn on my tablet koby 8065, every time i open it, it just stopped with the koby logo

If your Vivitar Camelio tablet is stuck on the opening screen, you can try the following steps to fix it:

1. Perform a soft reset by pressing and holding the power button for 10-15 seconds until the screen turns off. Then, release the power button and press it again to turn on the tablet.
2. If the soft reset doesn't work, try a hard reset by pressing and holding the volume up button and the power button at the same time for 10-15 seconds until the tablet vibrates and the Vivitar logo appears. Release the buttons and wait for the tablet to reboot.
3. If the above steps don't work, try connecting the tablet to a computer with a USB cable and see if it recognizes the device. If it does, you may be able to restore the tablet to its factory settings using software provided by Vivitar.
4. If none of the above steps work, you may need to contact Vivitar customer support for further assistance or bring the tablet to a repair shop.

Is it still under warranty? If so return it for repair.

This sounds like a problem I had with a smartphone, turned out to be a dying battery. Worth a try if you can change it easily.

there are many reasons, why this happens, try this instead, if this will help. boot to recovery, depending on your tablet, for android, turn off your tablet, then while turned off, press volume up and power same time till you see your tablets logo, wait until it opens recovery, then select wipe data/factory reset. this will bring back the tablet to its original state or factory default settings, after a wipe, select reboot system, the tablet will turn on again, loading the settings like the first time you bought it, and see if that helps.

http://www.hannspree.eu/en/troubleshooting/hannspad-ts-10-1

there should be a small hole in back to reset it

Try a factory reset. Try one of these:
1. Stick a pin in the reset hole.
2. Hold vol down (and home) while turning it on (not reset), hold until logo comes up.

contact vendor mfg - shoulds be under warranty

You need to reload the firmware operating system.
Here it is Support Firmware

Press and hold the power button for 30 seconds or until you see the Samsung logo.