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== <big>'''I can't turn on the computer, it doesn't wake up =='''</big>
* Please use the [[Airtop2 LED behavior description | Airtop3 LED behavior description]] for further diagnostics.
'''LED Diagnostics feature is available only for models configured the with FM-AT3 FACE module'''
=== 1. ''Possible reason: Power supply failure'' ======= Solution - Check power supply (PSU) ====
*Make sure the LED on the power brick is lit.
*Make sure the DC cable is not damaged and connected properly to the machine.
=== 2. ''Possible reason: Memory failure'' ======= Solution - Check memory (RAM) ====
*Verify diagnostic LED (R) lit <span style="background:Green">Green</span>*.
*If lit in <span style="background:yellow">Yellow</span> it means memory initialization has failed.
'''*LED Diagnostics feature is available only for models configured the with FM-AT3 FACE module'''
=== 3. ''Possible reason: Peripherals failure'' ======= Solution - 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. ''Airtop3 BIOS reset''===
Reset BIOS settings to default for [[Fitlet2: Revision Notes#Airtop3 Rev 1.2 | Airtop3 revisions 1.2 and later]]:
* For Airtop3 older than rev 1.2 see [[Fitlet2 BIOS reset for rev 1.1 and older]]
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*[https://fit-pc.com/wiki/index.php?title=Airtop3_Troubleshooting '''Back to Troubleshooting Menu''']
*[https://fit-pc.com/wiki/index.php?title=Airtop3 '''Back to Airtop3 Menu''']
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