Model S400CA-CA006H, Power ON, only back lit blank display. Battery icon is green while the BULB icon LED is orange in colour.

Since you have been using the upgraded version of windows for a couple of months I would say the two incidents aren't connected.
If win 8.1 was the root cause the problem would have presented itself shortly after the upgrade.
It sounds more like the cable from the motherboard to the monitor is either lose or broken. After all it runs through the part you move everytime you open, close or adjust the laptop, so it is in a exposed situation.
Normally it is quite easy to fix, but you need to take it to a hardware repair store.

The question is not clear... which of the LED`s are lit?? green, yellow, red.is there a message on the screen??

Perform an EEPROM reset:

1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)
The number of the Reset
button pressing
LED Function Remarks

0 time Green Power off
1 time Orange Service pattern print
2 times Green EEPROM print
3 times Orange EEPROM reset
4 times Green Waste ink counter reset See waste ink counter reset
procedures below.
5 times Orange Destination setting See Destination setting
procedures below.
6 times Green Print head deep cleaning
11 times Orange Button / LCD checking
12 or more times Returns to a menu selection

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response. Happy Holidays!

Thanks, Joe

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

actually if u repair an aoc monitor alone without getting connected to cpu once u switch on the monitor all led's will lit on ( green light ) it will remain on situation until u connect the vga connector to cpu that's the time led's will lit off and only the power led will remain in green condition.some aoc 5en once u power on power led is in green condition and if not connected to cpu it will be in orange condition.hope u get some idea but i am not sure if it will work with ur monitor. but as long as LEDs lit on i think no problem with ur monitor.

(11/24)
＜Service mode operation procedures＞
1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)


(11/24)
＜Service mode operation procedures＞
1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)
The number of the Reset
button pressing
LED Function Remarks
0 time Green Power off
1 time Orange Service pattern print See APPENDIX 1:
SHIPMENT INSPECTION
PATTERN 1: PRINT
SAMPLE
2 times Green EEPROM print See APPENDIX 2:
EEPROM INFORMATION
PRINT
3 times Orange EEPROM reset
4 times Green Waste ink counter reset See waste ink counter reset
procedures below.
5 times Orange Destination setting See Destination setting
procedures below.
6 times Green Print head deep cleaning
11 times Orange Button / LCD checking
12 or more times Returns to a menu selection

(12/24)
<Destination setting procedures>
At Logic board replacement, make settings for each destination.
The number of the Reset
button pressing
LED Destination Paper for defaulte setting
0 time Green No change
1 time Orange Japan A4
2 times Green Korea A4
3 times Orange US/Canada Letter
4 times Green Europe A4
5 times Orange Australia A4
6 or more times Returns to a menu selection A4
<Waste ink counter reset procedures>
At the waste ink absorber replacement, reset the waste ink counter for the replaced waste ink absorber.
Setting operation for the waste ink counter (The counter setting value is selected by pressing the Reset button.)
The number of the Reset button
pressing
LED
0 time Green Reset the main waste ink counter to 0%.
1 time Orange Reset the platen waste ink counter to 0%.
2 times Green Reset the Main & platen waste ink counter to 0%. (Reset
collectively.)
<Button / LCD checking operation procedures>
At Operation panel unit replacement, check the button / LCD.
1. When pressing the Stop button two times, the machine will be moved into an LED confirmation mode.
2. As often as the Color button is pressed one time, each LED is lit one by one, and the machine get in the mode in which each
button is acceptable.
3. As often as each buttons on the panel is pressed from the left to the right, the displayed number is counted up.
Pressed button Display
Maintenance 1
Fit to Page 2
SCAN 3
Paper size 4
+ 5
Black 6
Color 7
Stop / Reset 8
On / Off 9
4. When all buttons are pressed, [1] will be displayed. Then, LED[8.5 x 11 Plain Paper] and LED[8.5 x 11 Photo Paper] will be lit on
the panel, and the machine will be in a service mode menu selection mode.

Dear User here is confiruration.
1.Orange with + sign and orange is for HDD LED.
2. Green with +Sign and Green is for Power LED.
3.Red is for Power switch.
4. Blue of Black is for Reset switch

A conflict in the IP address, resolve it

Hello,

There is an update for your printer. This is a firmware update. A firmware update, rewrites code located on the printer's main system board. The latest update is dated 10/17/08.

Flashing firmware does not have a go back element or undo, so it is really important that we verify your model and what seiries of printer you have. I suspect you have a CLP-300 Series printer and that the 310 of the 300 just describes some features added or left off and even who you purchased it from, in many cases.

Please look at these two photos and then post the data off the name plate for your model number in particular.



You will notice there are two lines to include in your reply.
1.) The Model: (first line)
2.) M/C entry (second to last entry in this photo of the label.

Once you verify this and I post the firmware update link for you, you will need to follow the instructions I include below.

Regards,
Worldvet


[from Samsung.com PDF file on this firmware upgrade]

Samsung has released a new Software upgrade file for print quality, automatic error recovery, and toner save mode on color laser printers.

Procedure to Set-up Download Mode on Your Printer - CLP-300 series
Turn power off.
While holding down the ‘STOP’ button on the Printer, turn the Printer back on.
Keep holding down the ‘STOP’ button until all the LEDs turn orange.
Then release the ‘STOP’ button, and press it again, one more time.

1. How to Upgrade
Please make sure to check the printer model number before performing the firmware upgrade.
2. Release Notes
Improved on light printing quality at low temperature environment
Automatic error recovery at abnormal operation
Toner save mode by optimized toner supplying
3. Caution
After firmware upgrade is completed, green LED lights will light up.
Do not turn off the printer before green LED lights turns on. A power interruption will corrupt the process.
If the printer is connected by a USB cable, disconnect all other USB devices, except your keyboard & mouse, from the computer.
If possible, be certain the Printer is connected to a BackUPS

Firmware Update Confirmation Instruction
Model CLP-300 series
When firmware upgrade is started, status LED light will start blinking.
As the printer reinitializes, status LED light will automatically turn off and then on.
Firmware upgrade is complete when status LED stays on green.

After firmware upgrade is completed, the LCD will display the message ‘Ready Copy’ and the LEDs will stay on green.

4. If there is an Error after firmware upgrade
If LED is on red or blinking after firmware upgrade, set-up download mode again and re-try the firmware upgrade.

TRY THIS STEPS...
Mp150 Reset Counter
Service mode operation procedures -
1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)
The number of the Reset
button pressing
LED Function Remarks
0 time Green Power off
1 time Orange Service pattern print
2 times Green EEPROM print
3 times Orange EEPROM reset
4 times Green Waste ink counter reset See waste ink counter reset
procedures below.
5 times Orange Destination setting See Destination setting
procedures below.
6 times Green Print head deep cleaning
11 times Orange Button / LCD checking
12 or more times Returns to a menu selection

TRY THIS STEPS...
Mp150 Reset Counter
Service mode operation procedures -
1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)
The number of the Reset
button pressing
LED Function Remarks
0 time Green Power off
1 time Orange Service pattern print
2 times Green EEPROM print
3 times Orange EEPROM reset
4 times Green Waste ink counter reset See waste ink counter reset
procedures below.
5 times Orange Destination setting See Destination setting
procedures below.
6 times Green Print head deep cleaning
11 times Orange Button / LCD checking
12 or more times Returns to a menu selection