"That" monitor is flickering on and off blue tint.
When I Googled it, it seems it's a video card problem. The video card on my d620 is a nVidia Quadro NVS 110M w/ 64MB of memory, apparently running at a low 69 C.
I did all the obvious stuff (reboot, reset, etc.) and it seems to be somewhat stable now.
Why is this happening and what can I do to fix it?