some reviews say that the board you've suggested, GIGABYTE GA-P35-DS3R LGA 775 Intel P35 ATX Intel Motherboard,"Would not POST again after [they] put the system in standby" ...
They say "This board has a bug, if you put the system in STANDBY mode and try to wake it up the system will not POST, the fans will start spinning for about 10 secs and the system shuts off and the the fans come on for 10 secs then shut off and this repeats forever. I have tried everything to no avial, clearing the CMOS, shorted the battery leads, unpluging the 12v connectors, etc In the process of RMA for a new one"
have you encountered this problem yourself?