I had experienced a similar behaviour upgrading both a DH57JG and a DH57DD. I had slow boot performance and various Video hardware error;s (i couple the boards with a i5-650 CPU). My solution was to reflash both of them with the same bios on top (0537) using the Recovery option.
Now both systems run as smoth as butter.
i have similiar problems with the dh57jg mainboards. system worked fine until update to that revision.
2x 2gb kingston ddr1333 and a i5-650 are installed. until bios update everything went fine. there are also NO heat problems (lian li case with 580W ps)
but now i do not get any video signal out of the quadro fx580
if i unplug the pcie card and use the onbard dvi - everything works fine. i just reflashed the 0537 but no video signal with
the quadro fx580. the quadro - on the other hand - works fine on another intel desktop board (matx).
so my questions now are: - is it possible that this pcie card doesnt work with the new revision of the bios?
- is it possible to force a downgrade to an elder revision?
help is appreciated