]"this seems to be a well known issue with this board and the common answers are replace bios chip or rma the board.
on a warm boot (reboot) the GURU Power On Sequence isn't used because it's assumed the voltages are already stable (the psu is already in use) so only the AWARD sequence is processed and it does no voltage checking -- if there were a power problem though it would still be evident due to the system crashing.
so it would appear the problem is confined to the GURU Power On Sequence code of the post code (which is processed for the cold boot only).
your observation that the graphics fan is unpowered when there is a 90 failure would indicate there is a problem when initializing the PCIe power controller IC resulting in no PCIe voltage which would lead to a failed voltage ready state and thus the Power On Sequence fails.
if it were a code error then a bios update could have corrected it, so it's likely a circuit design error or component failure.
the odd thing about this is there are two solutions -- suggesting two problems -- one being there is a problem with (some) bios chips and the other being (some) boards have circuit (and/or signal) issues."[/