Working on very important work PC. Running the P5E3 Deluxe. I have 4 sticks of 1gb TeamExtreme 1333 ram. I am using an 8600GTS graphics card. The CPU is intel Quad core Q9550 - the C1 stepping.
I originally had a Q9550 with a E0 Stepping, but the PC would give me blank screen. I switched to C1 - still nothing. So, I used an older quad core, put in only 1 stick of ram, erased CMOS and finally got into BIOS.
I used a flashdrive to update bios and was able to do that. I then tried putting all sticks of memory back in, and got it to work with that. Then once I tried putting the new Q9550 CPU back in (c1 stepping again) - nothing.
The bios is supposed to support it officially. Also, I tried both CPUs in another pc - worked great.