'97 Olds Cutlass Supreme - no dash lights

All dash lights work until headlights are turned on… then all dash display lights do not come on… the radio display also goes black, but radio still works… normally the radio display would dim when headlights are turned on… fuses ok.

Any ideas of what causes this? Anyone have similar problem?

Specific circuit componet failed? Dimmer reostat faulty? No ground in circuit?

It sound as if the dimmer for the dash is burned out. See if the lights come on when setting the dimmer to full brightness.