Cursor blinking only with 8GB of RAM

I would like to put 4x2GB of DDR2 RAM on my ASUS M2N-E board.
If I put 2x2GB in Slot 1-3 and 1x2GB in Slot 2, it boots but if I put another 2GB stick in Slot 4, it posts, shows me the Nethserver versions, I select the top one then it doesn’t boot, just showing me a blinking cursor in the top left corner.

The board supports 8GB of RAM, it’s the maximum. In the BIOS, it shows me 8192MB. I got the modules from another server, so they are fine.

My OS is up to date, everything is fine except I can’t put 8GB in my server.

Where should I start troubleshooting? I already tried to exchange the sticks in Slot 2 but nothing. It always boots if Slot 4 is empty. I don’t understand. If the 4th slot is bad, then why does it show up in the BIOS?

Thank you very much in advance for your reply!

EDIT: I managed to boot Windows with Slot 4 empty.

Slot 4 could be toast.
Run a ram test.


Unfortunately yes, Slot 4 is bad but how can the BIOS detect all 8GB of RAM?

Why not.
Depends on what is fried.
Detecting is one thing (reading an ID from specific pins), using is another.