M2-ATX problem to boot Pentium M mobo
I have a M2-ATX power suply that I have had working without any problem over a year in my car. I have been running an intel D201GLY2A and a 2.5" hard drive together with power for my 7" screen and a usb hub.
I recently bought a second hand mobo BCM MX855E with an 1.7Ghz Pentium M processor with a CF adapter. I installed and prepared everything home connected to a normal power supply. It worked very well and the CPU power is much betther compared to the D201GLY2A board.
Now I unmounted the M2-ATX supply and tried to connect it to the new mobo but it won't boot. The led start light and the usb hard drive starts but no beep or VGA post. I have tried to set the M2-ATX power supply to normal ATX mode so I removed the jumper to verify it had nothing to do with the timing issue problem I found described in the forum. But it didn't help.
I can't get my new mobo to boot with the M2-ATX supply. When I try with my regular power supply it works fine and when I try the M2-ATX supply on the intel mobo it works fine.
Any suggestion what I can do?
Is pentium M mobo most often use 5V rail to get power to CPU or do they use 12V rail?
Shall I try and get a M1-ATX to get more power on the 5V rail? Can it be any problem like that?