No power when I try and turn it on

You can try a factory restore, but if that doesn't work you will need to buy a new tablet. These cheap tablets are throw-aways unfortunately. Note that a factory restore will erase any files you have on the device.

Factory Restore on Android devices:
- Turn off the device
- Hold Volume Down and also press the Power button until a menu comes up
- Use the Volume Up and Down buttons to select Factory Reset (or Restore)
- Press Power to select

try cold reset by removing the battery including power adapter then press power button for approx. 20 secs. then plug your power adapter then press power button again. press the numlock/ capslock button if there is response showing that your motherboard isnt dead yet. please check also when fan is running momentarily then suddenly stops then post another question here.

Press and hold the power button for fifteen seconds or so. Does it turn off then? If so, press and hold the power button for a second or two. Does it start to reboot then? Does it work properly now?

Have you tried a screen calibration? Turn off the unit then press and hold the upper left of the screen as you turn it on. A dot will show up on screen and then press the dot firmly as it moves around the screen. When it is done it will say screen calibration complete.
I also assume you tried a reset by pressing the reset button or on the newer units just hold the power button while turning it on for about 15 seconds until it reboots.
Thanks for using FixYa

Alright, not sure if this will help, by my understanding is that you are saying that when you power the computer using the power supply adapter, nothing comes on? Then when you have your battery installed on, then there are lights blinking from your battery charger LED amount of times. In this case there are no promblem with your laptop and it is your power supply adapter that is damaged and will need to be replaced. It is not charging the battery. The battery is still good, but does not have enought charge to power up your system. You can find a charger on ebay for a good reasonable price compare to getting it from Hp. I hope this can help you.

try to press and hold Fn and F8 - this is to toggle screen setting to ext and back to LCD on laptop. if nothing happens turn off computer by pressing power button, unplug the ac adapter, remove the battery. remvoe residual electricity from computer by pressing power button 10 times. just plug again the ac and leave the battery out. Pres and hold the letter D and while holding that press the power button once and release both of them. it will perform the built in self test on the lcd. if nothing happens, turn off computer. press anf hold Fn and while holding it press power button. it will perform diagnosis on computer. if still nothing happens need to repalce motherboard and LCD.

try changing the power cord if you ve not done that

1. Hold on TV and POWER simultaneously (light comes on), let go

2. Press POWER then CH+ back and forth (light comes on), when TV turns off

3. press STOP, code is saved!

ok,your monitor is in  a very simple problem.clean the control panel circuit of your monitor,or if it is not working replace the tact switch in your monitor.