this pc Desktop is now retired at HP, no support. 12 years old now.
that depend on 2 things what is wrong.? (hdd or OS dead)
came new with XP the dead OS>.
if you have the HP hot key f11 working
or of you have the HP install media kit for it.
i guess the screens ok, and BIOS is OK, hit the bios key yet? power on hit what the screen tell you, at power on.
if that works and the OS fails to boot?
that means the startup files are bad on hdd
or HDD is bad
or the OS is corrupted.
what I do is boot to linux live cd/dvd or usb stick
if that works we know the HDD is the problem in 1min flat.
the we, hit f11 at power on and pick restore, and pick
the 2005 is us on the cusp of having F11 working or not
F11 is the key that has the full XP install on the HDD.
we run a linux (knoppix 7) DVD there and do the DISK test there.
if that fails the HDD is bad.
see it run here, this live DVD OS is the best test disk around.
and 100% free. if you can burn it or burn to USBSTICK mem.
running knoppix tells me pc is ok
and at same time the HDD is good or bad.
if the F11 key works, then if lucky you can do repair restore.
or a start up file fix.
F11 runs the HP restore partitions,
id read you service Guide for you and look but HP deleted it.