the rear of most desktops have 2 VGA jacks
the onboard. VGA
and the better grade, PCI-express slot GPU card. VGA jack.
which one do you use?
not only that , 100s of PCI GPU cards could be in that slot.
looking or telling what you have or a photo of the rear helps.
unlike laptops, desk tops can have any thing there.
this PC is relic of long long ago. worth zero value today. 14yo.
HP owns COmpaq now, and all support ended long ago for this PC.
is this the old C500 series PC, no service tag data show by you, full tag data.
my wild guess, Pdp124p is the PSU power supply number
sorry that is not the PCs model number.
i see google showing it was used on a D530 SFF.
Small form factor case = SFF
ill now answer as though you said, D530 VGA onboard. jack1.
d530 s (c or u) s = sff, the PC came in 3 case types!!!
the jack1 below is wired to.
ntel Extreme Graphics 2 (integrated with Intel 865G chipset)
the jack 2 option VGA was sold with
NVIDIA Quadro4 100NVS AGP (64MB, dual VGA) full height
or 3 others sold by compaq day1
or if others like me added faster cards, there 100s possible
only looking and reading finds the cards model.
ill pretend its jack 1.
Intel Extreme Graphics 2 (integrated with Intel 865G chipset
Intel does not support drivers for w7 on there old chip.
HP(compaq) did but does not support this PC now.
you can ask HP on there forum for the driver.
be step1, and if fails buy a new GPU card and plug it in
and use that.
more? (intel.com) words (intel pulled the plug, dead see?)
id put in a new card, at point 2. that has w6 support, sure would.,
but you can ask at HP, Fixya is not HP, sorry to say.
the Real HP (and compaq) IS HERE, THERE FORUM.