HANNSPREE 25 st259mub

A Hard Reset is the only way. Normally an Android reset is as follows;

Power OFF.
Press and Hold Volume Up and Power Button for 12 seconds.

However this says different

Press and hold the power button for 8 seconds to reset and reboot.

Hannspree Hannspad SN1AT71 Troubleshooting - iFixit

Videos as well

https://www.google.com/search?q=hannspree+sn1at71+hard+reset

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We are asking what number, times itself, is equal to 30. Five times itself is 25. Six times itself is 36. The answer is somewhere between 5 and 6. Let's split the difference and try 5.5. 5.5 times 5.5 is 30.25. This is above 30, so let's try a smaller number, 5.4. 5.4 times 5.4 is 29.16. This is lower than 30, so we need a higher number. How about 5.45? I get 29.7025. We need a number a little higher. How about 5.47? I get 29.9209. Still need a little higher. How about 5.48? 30.0304. So it is somewhere between 5.47 and 5.48.

On a calculator, you can use the square root function. Sometimes you have to enter the number before you hit the square root function and sometimes you need to enter the number after hitting the square root function. Another way of doing it is to use the exponent function, usually with a y to the x key or a ^ key. Enter 30, hit the exponent key, and then enter 1 divided by 2 in brackets.

I get approximately 5.477225575051661134569697828008.

Good luck.

Paul

are you sure that you have recharged the battery fully ?? It could be some kinds of virus, try to remove all connections and extra cards and try to open it again

how do i reset the hannspree

No - the buzzing you're hearing is probably the inverter transformer. Its' purpose is to generate high voltage to turn on the backlight to display the image on the screen. The monitor should still be under manufacturers warranty since most of them are a year. Have it repaired or replaced.

Need code for hannspree 25" tv to use on a dishnet remote control

try to boot in safe mode by pressing F8 when you turn on the computer use the up/down arrow key to highlight safemode and press enter press enter to select your OS then wait until it loads. during boot up if it still shows the little squares try a known good monitor if it has the little square the video card is busted and needs to be replaced however if ever the known good monitor doesnt have the little square then its the monitor that needs to be replaced.
hope this help

try this

press tv button (lights up red)

hold setup button for 10 seconds (tv button blinks twice)

enter code 10030

Press power button on top right. If tv turns off your good

If it doesnt work follow steps above but try these other codes 11348, 11745, 11783

Try these per remote manual: Hannspree 11348, 11745, 11783

i have 3 hannspree monitors 2 were sent back for repair i replacement was faulty when i got it back the other one changes flashing colours never again i tried turning the brightness to full which helped for a time