SAFE BEEPS AT NIGHT AND AN AMBER FLASHING LIGHT IS INDICATED ON THE TOP RIGHT HAND BUTTON. WHAT DOES THIS MEAN? I HAVE CHANGED THE BATTERIES BUT DOES NOT DO ANYTHING

A red light indicates the charger is charging the battery, an amber light means it has switched from fast rate charging to trickle to keep the battery topped off, and green would mean the battery is completely charged. But don't be fooled waiting for green, many times the charger will only be on green for a moment before changing to amber and keeping the battery topped off.

Flashing can be a sign of a problem on some chargers.

A rapid flashing red can on some chargers indicate a bad or shorted battery, or a bad battery contact in the charger itself. If in question, try a different battery on the charger or compare with another charger to determine if the blinking is normal.

Best regards.

from the web -
1 Removed the battery
2 Removed the AC power
3 Plugged in the AC power again
Note:- At this point the light from flashing amber light to solid green indicating AC Power
4 Plugged in the Battery
Note:- Solid green AC power light and Amber charge light

Hi

To change the code open the safe, press the red button and the yellow light goes on, indicating that enter the state to change the code. Input the new code (1 to 8bits), then press ‘B’ or ‘A’ button, it will be confirmed by two beeps, indicating that the new code have been accepted and stored. However, if the yellow flash with the buzzer beeps three times means the new code is invalid and should operate again.

Hope this helps

Thanks
Daniel

I had the same problem, I removed the bettery while it was still plugged in, tested it, then plugged it back and and now all is fine.
or you may try If an AC adapter is not connected to your computer, the computer's power source
is a battery. If the battery indicator flashes amber or is a steady amber, the
battery needs to be charged. If the battery is flashing green and amber, the
battery may be defective. To troubleshoot this problem, use the following
procedure.
1. Turn off the computer and peripherals, and disconnect them from AC power.
2. Reseat each installed battery by removing it and then replacing it.
3. Turn on the computer. Does the green power indicator light up?
Allow one minute for the computer to initialize its components before checking
for signs of power.
Yes. Continue to step 4.
No. Use the AC adapter to connect your computer to AC power. If the computer
operates normally when using AC power, go to step 7. If the computer does not
boot when using the AC adapter, see the previous subsection, "Total Power
Failure When Using the AC Adapter."
4. Does the battery indicator flash amber or show a a steady amber light?
Yes. The battery needs to be charged. Go step 5.
No. Go to step 7.
5. Connect the computer to AC power, and fully charge the battery.
For instructions, see the topic titled "Charging the Battery" in the online
System User's Guide.
6. As the battery charges, does the green battery indicator light up?
Yes. Go to step 9.
No. Go to step 7.
7. Is the battery indicator flashing green and amber?
Yes. Your computer may be in a hot environment. Charging the battery in this
condition may affect the life span of the battery. Continue to step 8.
No. The problem is resolved.
8. Disconnect the computer from AC power. Is the the battery indicator still
flashing amber?
Yes. You may have a defective battery. Continue to step 9.
No. The problem is resolved.
9. Remove the battery, and press its test button. Is the uppermost indicator in
the charge gauge of the battery flashing?
Yes. You have a defective battery. Continue to step 9.
No. The problem is resolved.
10. If a spare battery is available, fully charge it, and then install it in the
computer.
11. Turn on the computer. Is the power indicator off?
Yes. Your original battery is defective - please look for a replacement. Hope it helps.

LED indicator for your laptop model
Steady Blue = Battery charged and AC adapter plugged in
Amber = Battery charging and AC adapter plugged in
Slow Amber Flash = <10% battery life
Fast amber flash = 3% remaining TPC will automatically go into hibernate
Slow flashing amber Adapter plugged in = Overheat condition

Do you have a multimeter to test the battery that you are using? check the output current of the battery.

The Battery indicator LED is to the right of the power LED. Flashing AMBER indicates a fault with the Battery. To resolve, replace the system battery.

The operating instructions on the ES20 as per the crappy manual:

Open safe using emergency key provided

Insert batteries in the box inside the door

Opening the safe
a. pre-set factory code 159
b. input 159 (the yellow light will flash and the buzzer will beep), then press B or A button, the green light will be on, rotate the knob clockwise, pull outwards, the door is opened

Closing the safe: close the door, input the code (the green light will flash for 5 secs). Turn the knob anti clockwise, the control system will activate and the safe will be locked

Changing the code: open the safe, press the red button located inside the door, the yellow light will go on indicating the code can be changed. Input the new code (1-8 digits), then press A or B button, it shall be confirmed by two beeps indicating the new code has been accepted and stored. If the yellow light and buzzer beeps 3 times the code is invalid - try again

Emergency Key - store in secure place NOT inside the safe. Remove the override cover in the centre of the face of Safe (its a silver plastic panel with Sandleford Electronic Safe ES20 on it), insert override key (a cyclinder key) - hidden underneath the override cover panel - and turn anti clockwise, rotate the knob clockwise to open door

Changing the Battery - If the red and green light are on this indicates that the batteries are low and require changing. To ensure the batteries have been installed correctly test before closing the door

References:
1. Operating instructions EA Electronic Safe
2. http://www.secustar.com/products-en/estype-safe.htm

The icons from the left: 1. Power indocator 2. Hard Disk indicator --> it is a tube icon, not battery, but means hard drive. 3. Power Source indicator 4. Bluetooth indicator
The third from left means the power source indicator. Normally it is light green. If there is battery problem (can not charge or battery overload) it flashes amber/orange. If flashes red, it indicates that the battery power is low. You need to change the battery or connect the AC adapter.
Regards, 
Dapid Candra

try removing the memories, hard drive, optical drives and power on your computer. if the computer beeps it is an indication that your computer is working and one of the remaining part could be causing the no boot. if after removing all the parts your computer will not beep or the flashing amber light will not change it looks like you will need to replace your motherboard

Green:Fully charged
Amber:Improper connection
Red:Charging