OK. Now that I have your attention... I just upgraded my second rig with an E8200 that I took from my main rig (which now has an E8400). Here is the scenario. The system consists of: ASUS P5N32E-SLI motherboard BIOS 1403 (which supports the E8200) http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us&model=P5N32-E SLI E2180 processor @ 300X10 (this is being replaced by an E8200) OCZ Vendetta heatsink (rebranded Xigmatek HDT-S983) OCZ PC2-6400 SLI Memory 2 X 1GB sticks dual channel 2 X 7900GT SLI Ultra 650W SLI Power Supply Antec Sonata 2 case (120mm inlet, 120mm exhaust) WinXP 32 bit I removed my ASUS P5N32E-SLI motherboard from the case since I wanted to get a good solid attach on the heatsink when I changed the processor (I hate this Intel clip on heat sink design). Removed the E2180 and put in the E8200 processor. Applied new Arctic Ceramique compound and seated the heatsink. Reassembled the motherboard in the case and put all the cards back in. Hit the power button and.... nothing. No fans. Nothing. Oh oh... Then I remembered I had not cleared the BIOS. (It was on my list to do but I forgot). So I switch off the AC switch on the power supply and move the clear CMOS jumper over for about 60 seconds. Put the jumper back. Power on the supply... hit the power button and... all the fans come on, disk drives do their initialization thing, etc... but... no BIOS Beep. No display on the monitor. So I remove the BIOS battery, move the clip to clear CMOS and let it sit for 15 minutes. Put the battery back in and... same thing. Fans come on but no BIOS beep. So now I'm thinking... did I fry the E8200 by not clearing the BIOS? The E2180 had been setup to run at about 1.35V which "should" be in the safe range for the E8200. In fact, that is the voltage I was running it at in my P5K-E motherboard. So I remove the heatsink (this time without removing the motherboard) and pop my E2180 back in with the heatsink. Clear the BIOS. Same thing. Fans spin up but no BIOS beep, no display. So the motherboard is not working with either CPU now. So I am wondering... What would it have meant in the first round when the board did not power up at all? Does it require the CPU to do something to get to the stage where power is applied to the board and the fans spin up? And what else does the CPU need to do to get it to the next stage? i.e. BIOS beeps and allows you to enter. Any ideas? As a bit of a background I originally had some problems with this motherboard when I reseated the factory heatsink on the NB. Could not get it to post and when I removed the NB heatsink, a corner of the 680i chip did not have thermal compound on it. i.e. it was not sitting flat and squeezing the compound to the extreme corners. Reapplied paste and that solved it. Now I am thinking I will remove the NB heatsink again and make sure it is making good contact with the 680i chip. Maybe the process of removing the motherboard jarred it.