Synthex board: anyplace for "always on" LED light?

i'm trying to figure out where to plug in a LED as to show if the MD is ON or OFF.
as the LCD i have won't be visible (it's hidden behind a "door" in the rack i'm doing).
i have the MIDI LED, which is great for midi activity.
but where can i put an ON/OFF indicator/LED ?
btw. i only use the USB function (ie. no external power supply).
thanks.
as the LCD i have won't be visible (it's hidden behind a "door" in the rack i'm doing).
i have the MIDI LED, which is great for midi activity.
but where can i put an ON/OFF indicator/LED ?
btw. i only use the USB function (ie. no external power supply).
thanks.