Yes, the replacement motherboard works fine.
The system gets stuck the Initializing Intel(R) Boot Agent GE cl v0.1.10 PXE 2.1 Build 092 (WfM 2.0).  Some post say it's the hard drive but I can't accesss the BIOS and I tried a new unformated drive.  F2 and F12 say entering bios and boot list but they don't send me anywhere.   I disconnect all connections. I removed the CDROM, and pull the memory chips (all but 1).  I can't access the bios or get past the message.  I tried to reset password and the rtc pin.  nothing seems to work.
Initializing Intel(R) Boot Agent GE cl v0.1.10 PXE 2.1 B092 (WfM 2.0) cant get 
into bios