Chapter 3: Troubleshooting
65
3. Remove all memory modules and turn on the system (if the alarm is on, check the
specs of memory modules, reset the memory or try a different one).
System Boot Failure
If the system does not display POST (Power-On-Self-Test) or does not respond after the
power is turned on, check the following:
1. Check for any error beep from the motherboard speaker.
• If there is no error beep, try to turn on the system without DIMM modules installed. If there
is still no error beep, replace the motherboard.
• If there are error beeps, clear the CMOS settings by unplugging the power cord and
contacting both pads on the CMOS Clear Jumper (JBT1). Refer to Section 2-8 in Chapter 2.
2. Remove all components from the motherboard, especially the DIMM modules. Make
sure that system power is on and that memory error beeps are activated.
3. Turn on the system with only one DIMM module installed. If the system boots, check for
bad DIMM modules or slots by following the Memory Errors Troubleshooting procedure
in this Chapter.
Memory Errors
When a no-memory beep code is issued by the system, check the following:
1. Make sure that the memory modules are compatible with the system and that the
DIMMs are properly and fully installed. (For memory compatibility, refer to the memory
compatibility chart posted on our website at http://www.supermicro.com.)
2. Check if different speeds of DIMMs have been installed. It is strongly recommended that
you use the same RAM type and speed for all DIMMs in the system.
3. Make sure that you are using the correct type of UDIMM ECC DDR4 modules
recommended by the manufacturer.
4. Check for bad DIMM modules or slots by swapping a single module among all memory
slots and check the results.
5. Make sure that all memory modules are fully seated in their slots. Follow the instructions
given in Chapter 2.
6. Please follow the instructions given in the DIMM population tables listed in Section 2-4
to install your memory modules.
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