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Check if you have the correct memory population.
- DIMM A populated.
What do you mean by it is unknown in the bios?
All the best,
Try a bios recovery using a formatted USB media.
Instructions for Recovery BIOS Updates
In the unlikely event that a BIOS update is interrupted, it is possible the BIOS may be left in an unusable state. The recovery process requires the chassis to be opened to move the onboard BIOS Configuration Jumper.
WARNING: This process is intended to be performed by a trained technician.
Recovery with Formatted USB Stick
1. Copy the recovery file (*.bio) to a formatted usb disk.
2. Place the usb disk in the target system.
3. Shut down the system and unplug AC power.
4. Open the chassis and remove the BIOS Configuration Jumper. See the Technical Product Specification for details including the location of this jumper.
5. Power the system on.
6. Wait 2-5 minutes for the update to complete. When the usb drive LED is lit, the system is copying the recovery code into the FLASH device.
7. System will either turn off when the recovery process is completed or it will prompt you to turn off the system.
8. Remove usb disk
9. Replace the BIOS Configuration Jumper.
10. Restart system.
Note: these can be found on:
Make sure DIMM A slot 0 is populated.
"Make sure DIMM A slot 0 is populated."
Actually, you were right. That yellow bang disappeared when I fixed that problem.
Also, my BIOS was updated successfully through usb stick even before that memory error was fixed.
Anyway, everything works well now. Thank you very much!