== =[https://fit-pc.com/wiki/index.php?title=Airtop2_Troubleshooting_-_I_can%27t_turn_on_the_computer,_it_doesn%27t_wake_up <span style="color:green">I can't turn on the computer, it doesn't wake up? </span>] ===
* Please use the [===[https://fit-pc.com/wiki/index.php?title=Airtop2_with_Linux_starts_up_with_flickering/bad_display <span style="color:green">Airtop2 LED behavior descriptionwith Linux starts up with flickering/bad display</span>]] for further diagnostics.===
===1[https://fit-pc. Check power supply (PSU)com/wiki/index.php?title=Airtop2_Troubleshooting_-_I_don%27t_have_any_display_output,_there%27s_nothing_on_the_screen <span style==*Verify the power supply is not damaged and functions properly.*If you "color:green">I don't have another power supply use it to eliminate and determine any display output, there's nothing on the failing side.*In case you use other power supply make sure it provides uninterrupted power and stable grounding.screen</span>] ===
===2. Check memory (RAM)===
*Verify RAM modules are installed. The system will not boot without it.
*Also Swapping DIMMS with a good known working ones could eliminate memory stick issues.
'''LED-R (RAM)'''
This LED turns <span style="background:green">Green</span>, the moment the memory initialization is successful.
This LED is <span style="background:yellow">Yellow</span> while the memory initialization is in progress.
If the memory initialization has failed, for example: There is no DIMM installed / the DIMM is not supported - the R LED will stay <span style="background:yellow">Yellow</span>.
The R-LED should stay <span style="background:Green">Green</span> at normal operation, also after BIOS POST is over.
*available only for models with FM-AT2 FACE module*
===3. Check Peripherals (HDD/SSD/USB)===*Unplug peripherals and try to power up with bare minimum, that includes HDD/SSD/USB devices.*Verify power up without storage. Sometimes damaged drives may cause the overall system to malfunction. ===4. Airtop2 BIOS reset===*Power down the PC and unplug the power cable.*Open the service door.*Remove the disks cartridge.*Reset the BIOS by pressing the low profile push button SW1 (RTC_RST).*Mount the disks cartridge and close the door.*Plug the power and power up the PC (either auto-on or pressing power button). '''LED-B (BIOS)''' This LED is <span style="background:yellow">Yellow</span> after display initialization. If BIOS setup menu is needed, the DEL button is functional from the moment the B-LED is <span style="background:yellow">Yellow</span>. The B-LED is <span style="background:Green">Green</span> when the OS takes charge of the system. '''*LED Diagnostics feature is available only for models configured the with FM-AT2 FACE module*''' [[FileCategory:Airtop2-bios-reset.gif]] == I don't have any display output, nothing on the screen? == ===1.Screen functionality===* Make sure the screen is turned on and works properly.* The best way to check if plugging it to a good known working machine. ===2. Proper connectivity===* Check if the HDMI/DP cable are well connected to both the PC and the monitor '''LED-H (HDMI port)''' This LED is <span style="background:Green">Green</span> only when the HDMI port of the internal graphics is connected to a monitor. '''LED-D (Display Port)''' This LED is <span style="background:Green">Green</span> only when one or both of the Display Ports of the internal graphics are connected to a monitor. '''*LED Diagnostics feature is available only for models configured the with FM-AT2 FACE module*''' ===3. Validate memory===*Display issues on POST are a common symptom of incorrectly assembled or bad Memory DIMMS*Please refer to [http://fit-pc.com/wiki/index.php/Airtop2_Troubleshooting#2._Check_memory_.28RAM.29 Check memory RAM] to diagnose Memory
