ok, well im guessing that your modded ps2 does play back ups , correct?
if it does then your mod chip works , then all u need is the .elf file.
now what exacly do u wanan run? just HDLOADER? or ps2 menu , HDloader and other apps?
if u have the ps2menu.elf and hdloader.elf
put those on a cd with a notepad document . inside the notepad document , copy and paste this to the notepad:
BOOT2 = cdrom0:\PS2MENU.ELF;1
VER = 1.00
VMODE = NTSC
WHEN U GO TO SAVE THIS NOTEPAD
SAVE IT AS: SYSTEM.CNF
AS A MATTER AFACT , HERE , IVE DONE IT FOR U , JUST DOWNLOAD THIS NOTEPAD DOC. , PUT IT ON A CD WITH HDLOADER.ELF AND AND PS2MENU.ELF
ONLY NEED THE 3 FILES ON THE CD-R.
IT WILL START WITH PS2 MENU , FROM THERE , PRESS R1 , seclect MC , then if u did install the hdloader exploit , u shoudl see teh hdloader.elf... if not , press R1 again and go to CD , and run hdloader.elf from the cd.
this should work perfectly.