As I understand the tablet keeps flashing HP logo while attempting to charge it,
Don't worry as I'll be glad to help, however, to provide an accurate resolution, I need a few more details:
Have you attempted to install all available updates?
Does it boot into the main screen or is it stuck on the HP logo?
Did you reset the tablet?
While you respond to that, here's what you need to do:
If the Slate 7 or Slate 10 tablet does not startt normally, or if you do not remember the lock screen password, it may be necessary to perform a reset without turning on the tablet. Use the steps in this section to reset the tablet from the Android system recovery menu:
All data saved on your device is deleted when you perform a factory reset. All apps are uninstalled. Data stored in your Google Account can be restored. Back up all important files, either on the Web or with an external storage device, before resetting the tablet.
Disconnect the charging cable from the tablet.
With the tablet powered off, press and hold the volume up (+) button and power button at the same time.
When an HP logo appears on the screen, release the buttons.
When the Android system recovery menu appears, use the volume down button to highlight Wipe data/factory reset.
The touch screen is disabled when the tablet is in recovery mode. Use the volume up (+) and volume down (-) buttons to navigate up or down in the recovery menu. Use the power button to make a selection.
Figure : Wipe data/factory reset
Press the power button to select.
The screen displays Confirm wipe of all user data? THIS CAN NOT BE UNDONE. Use the volume down button to highlight Yes -- delete all user data.
Figure : Confirm wipe of all user data
Press the power button to confirm and begin the reset.
A recovery system screen shows the reset process. Wait for the reset process to complete.
When the screen displays the message Data wipe complete, highlight Reboot system now, and then press the power button to select.