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38 Veriton N2110G Service Guide
System Internal Inspection
1. Turn off the power to the computer and all peripherals.
2. Unplug the power cord from the computer.
3. Unplug the network cable and all connected peripheral devices from the computer.
4. Place the computer on a flat, steady surface.
5. Remove the side panel as described in page 15.
6. Verify that the SSD module and the RTC battery are properly seated.
7. Remove the mainboard as described in page 21.
8. Verify that memory module(s) are properly seated.
9. Verify that all components are Acer-qualified and supported.
10. Reinstall the mainboard.
11. Reinstall the side panel.
12. Power on the system.
If the cause of the failure is still can not be determined, review the POST messages and BIOS
checkpoints during the system startup.
Checkpoints
A checkpoint is either a byte or word value output to I/O port 80h. The BIOS outputs checkpoints during
bootblock and Power-On Self Test (POST) to indicate the task the system is currently executing. Checkpoints
are very useful in aiding software developers or technicians in debugging problems that occur during the
pre-boot process.
Viewing BIOS Checkpoints
Viewing all checkpoints generated by the BIOS requires a checkpoint card, also referred to as a POST card or
POST diagnostic card. These are ISA or PCI add-in cards that show the value of I/O port 80h on a LED
display. Checkpoints may appear on the bottom right corner of the screen during POST. This display method is
limited, since it only displays checkpoints that occur after the video card has been activated.
NOTE: Please note that checkpoints may differ between different platforms based on system configuration.
Checkpoints may change due to vendor requirements, system chipset or option ROMs from add-in PCI
devices.
UEFI BIOS POST Code Checkpoints
The UEFI BIOS POST Code sets up the chipset, memory, and other components before system memory is
available. The following table describes the type of checkpoints that may occur during the boot block
initialization portion of the BIOS.
Checkpoint Description
0x01 – 0x0F SEC Status Codes & Errors
0x10 – 0x2F PEI execution up to and including memory detection
0x30 – 0x4F PEI execution after memory detection
0x50 – 0x5F PEI errors
0x60 – 0xCF DXE execution up to BDS
0xD0 – 0xDF DXE errors
0xE0 – 0xE8 S3 Resume (PEI)
0xE9 – 0xEF S3 Resume errors (PEI)
0xF0 – 0xF8 Recovery (PEI)