the monitor is bad
if it will not power on,
or show NOSIG< with XBOX on then turned off the monitor must show NOSIG>
why not test the monitor on any pc made even laptops VGA jacks works, so that works, its not the monitor.
and bad xbox video caused. but is not it. as you said.
the menu needs sync lines active. to pops the OSD button menu.
so the monitor is bad.
or the cable.
what is w2007, lets see.?
its old. at 1680 x 1050 @ 60 Hz
this old monitor runs CCFL lamps.]
im shocked it glows at all up to now.
ever do flash light trick test?
see got data, but no back light, CFFL is dead.
users guide last page.
This HP product contains mercury in the fluorescent lamp
in the display LCD that might
require special handling at
that means CCFL died, also all do, soon.
(as short as 2 years, full time , they die. 20k hours)
out of your service manual it shows.
what any running pc connected the OSD menu most work
not in sleep mode.
if there is sinc, H/V pins active
that OSD must work or the blacklamp is dead
use flashlight see, there is data there, see?