convert result can not be read..

hi everyone, i am new here.
i have 1 problem. i still use ePSXe 1.6, coz stable in my PC. and then i found a game "hogs of war", but this file burned into *.mdf image file which ePSXe 1.6 can not open this file type. then, i convert this file into *.iso. after that, i try to open that file(iso) with ePSXe 1.6, but not work. only black screen appear.
something wrong?
please i need an answer..
thanks be4.plugins:
video: pete's openGL2 driver 2.9
audio: p.e.op.s dsound audio driver 1.9
bios:scph1001.bin

What did you use to convert it?

you should not convert images. Mount the image using daemon tools (theres a free version) and play it as if you had the CD in the drive.

i use ISopen to convert, its free.is daemon can use to play playstation/psx game, but how?

No, it mounts the image into a virtual drive. Then you can play from it, or make an image of whatever format you need from it.