Coby mid7048 won't boot past Android screen and won't turn 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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Dear Anon, I suggest uninstall/reinstall utube,sign back in....

http://www.howtogeek.com/226942/what-to-do-if-you-forget-your-android-phone's-pin-pattern-or-password/

Hope this helps

do you browse in order to direct the download to your sd card, it might be that it is not found automatically

unlock it
then

it would have to be replaced, as it seems there is some physical damage if the screen is white.

1. Turn off the unit completely.
2. Press and hold the volume down (-) button.
3. While holding down the volume down (-) button, press the power button to turn on the unit. Once you see Coby logo on the screen, you can release the power button, but you still need to keep holding the volume down (-) button until you see Android robot logo on the screen.
4. The "Android system recovery" menu will appear on the screen. The volume up (+) button is used to scroll up in the menu list, while the volume down (-) button is used to scroll down. The power button is used to select and/or enter an option.

well thats strange,, the tablet has 1 USB 2.0 port and the keyboard connects to that port as its standard.. Its a standard port so all usb 2.0 connects for it is standard.

http://www.amazon.com/Coby-MID7015-Android-Internet-Touchscreen/dp/B0047Q9GT4#productDetails

and

http://www.amazon.com/Tablet-Stand-USB-Keyboard-Carrying/dp/B004OB0EBQ/ref=pd_bxgy_pc_img_y

is what u have right ??? try turning the connector around.. It should fit.

Here is the instruction on how to do the factory data reset when a customer locks the system and lost his security password/pattern. This instruction works for MID7016 and MID7022. An end user must follow each step precisely. Otherwise, he/she will not access to the system menu mode.

• Connect the AC power adapter.
• Turn on the system.
• Press and hold the power button until the popup window of "Device options" appears on the screen.
• Select the "Power off" option from the popup window. You will see another popup window of "Power off".
• Select the "OK" option. The unit will turn off.
• While holding down the "BACK" button, press and hold the "POWER" button until Coby logo appears on the screen.
• Release both buttons once you see Coby logo on the screen and wait for a while. The Coby logo screen will change to Android logo.
• Wait about 15 seconds after you see Android logo. (Do not press any button while waiting. If you do, you will not be able to access to the system menu.)
• Press the "BACK" button once. The system menu screen will appear on the screen.
• Choose the "wipe data/factory reset" by using the "HOME" and "MENU" buttons. (The "MENU" button will allow you to browse down through the option list, while the "HOME" button will allow you to browse up through the list.)
• Press the "BACK" button once you select the "wipe data/factory reset" option. The confirmation message will appear on the screen with YES or NO option.
• Choose the "Yes - delete all user data" option by using the "HOME" and "MENU" buttons.
• Press the "BACK" button once the "Yes - delete all user data" option is selected. It will perform the factory data reset. Wait until it is done. Once it is done, the main system menu will appear on the screen again, and the "reboot system now" option will be selected as a default. If not, you will need to select the "reboot system now" option from the list.
• Press the "BACK" button to reboot the system. The system will reboot with the initial factory data setting. All user data will be lost.

Give the reboot at least 5 minutes. Do not assume the unit has frozen