I started with a good feeling on this one, but it didn’t turned out like it should.
There is a blue led on the MSI Z87 GD65, always on and no possibility to power it off in the bios.
So I thought 3 things: a big marker, paint and / or tape.
Neither of them worked for 100% (you could still see some light) so I ended up by removing it completely
The annoying LED
And while we’re at it, I painted the white front led in red too