Hello. I have a big problem with my PC and I believe the culprit is my M2N32 SLI Deluxe. Here is my config: - CPU: AMD Athlon X2 5200+ (~2,1 Ghz) - Heatsink: Thermalright 120 Extreme with a Noctua 12cm fan plugged in the MoBo socket. - MoBo: Asus M2N32-SLI Deluxe - RAM: 2 x 1 Gb Corsair Dominator DDR2 PC6400CAS4 - Video Card: Nvidia 9800 GTX (512 Mb) - PSU: Enermax Modu82+ 625W Nothing overclocked. Other components (HDDs, screen, sound card, etc...) are not important. My CPU and 2 x system fans spin at around 700 RPMS in idle, temps for the 2 cores of my CPU are around 25-30°C idle, 50-55°C load (orthos etc...). My normal start-up sequence went about this way for over 2 years: - Press power button. - All system fans spin to max RPM. - MoBo beeps once to signal "good POST". - All system fans spin down to normal RPM. - Video output with information about video card BIOS. - Standard system startup screen with "press DEL to enter BIOS". - And so on. Sunday evening I shut down the system after using it the whole day with no problem at all. The shutdown went flawlessly. I turned off the PSU and the switch on the power extension cord, but left it plugged in the wall socket, as I usually do before going to bed. Monday afternoon I got back from work and switched on the system and instead of the normal sequence, I got: all fans spin to max RPM, no beep from the embedded mic of the MoBo, no output on screen, then after exactly 3 seconds everything shuts down. I tried again and again, and got the same every time. Thinking something could have come loose due to thermal expansion (it is the middle of the hot season here) I opened the case and checked every connection, but found nothing amiss. I tried again to power up with the case open, no luck. I started disconnecting everything not necessary to boot to BIOS, meaning HDDs, optical drive, soundcard, case fans, everything. This left me with my minimal config able to boot, that is: - CPU - Heatsink + fan plugged in the cpu-fan socket onthe MoBo - MoBo - RAM x 2 - Video Card - PSU. I tried again to boot, no effect, still 3 seconds of life then shut down. I removed the RAM, then tried with one stick in every slot, no luck. I swapped the video card for and older PCI-E ATI card, no luck. I swapped the PSU with another 500w one, no change. I tried to power on with only CPU, heatsink, MoBo and PSU: it stays on for a few seconds, the fan spin slowly (not max rpms), then shuts down. Each and every time, no matter the configuration, I get no beeps whatsoever. I was getting a beep when everything booted ok, so I think my MoBo has some kind of embedded buzzer. I tried to plug in a very old speaker from a very old case (from a time when 486DX2 was all the rage) and got nothing from it, either. I tried to clear the CMOS, removing the battery and leaving the cap on jumpers 2-3 for over 15 minutes, nothing. I replaced the battery with a new one (the MoBo was bought in Feb-2007), cleared the CMOS again, no change at all. I removed the heatsink, cleaned the old thermal paste from both surfaces, reseated the CPU, put on a fresh coating of thermal paste, reseated the heatsink, nothing changed. I am at my wits end. I hardly believe my CPU is fried, since I never overclocked it. I don't have a compatible stick of ram to test the system, only my 2 old ones, but I hardly believe a bad stick of ram could make the system shut down: fail to POST or to boot to BIOS, yes, shut down, nope. I also can't believe the CPU protection failsafe could kick in after 3 seconds, a CPU just can't get so hot in 3 seconds that it risks frying. Am I experiencing a zapped BIOS flash-rom? Is my BIOS gone from the chip? I tried the recovery method described on www biosman com to recover a bad Award bios, but I don't get a response from either a USB stick loaded with the described files, or the original ASUS motherboard CD in the optical drive. Still 3 seconds of power, then it shuts down. The computer ran fine for 2 years with this exact configuration, I experienced no instability, no blue screens, no freezes. Temps were fine last time I checked. I cleaned it with compressed air no more than 2 months before it gave me this bad surprise. Any help will be greatly appreciated. And sorry for any errors or strange expressions: English is not my native language.