I've run a few P4M cpus through several 865 boards. A quick list that I can remember:
Aopen AX4SG-UN
Abit AI7
AsRock P4i65GV
If you are in doubt, grab a cheap SiS board (648FX, 661, etc). They almost always work w/ P4M. I just moved my mobile P4M 1.7 from the Aopen board above to an Abit BG7 that works as well. A few others I've used with mobiles are
Asus P4S800
Abit BG7
If you need a known working test bed, shoot me a pm.
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Edit: From BigBadBiologist in
Karaktu's Mobile Celeron thread:
"I'll add my experiences to the list. I have a Mobile Celeron (P4 based) 1.5. I forget the SL number; it's probably SL6M5.
Abit IS7 (latest BIOS)
-will not POST unless you do the AE1 pin trick.
-runs all day at 200FSB (3GHz @ 1.55V), limit seems to be around 3.1GHz.
-use lapped penny to make contact with stock Intel HSF"
So your IS7 may have some issues recognizing the mobile part. Best of luck.