Dear Tech'ers, Over the weekend I collected a few system parts: ASUS P8P67-B3 Intel 2600K Own parts: ASUS HD5870 1GB V2 Zalman ZM600-HP (modular, a few years old) RAM The 2600K is used and supposedly bought in working order. The CPU came packaged in toilet paper in a quality box with a lot of protection material in it. There was a bit of hardened thermal gresae on the contact side of it - I cleaned this when I re-assembled the system. The P8P67-B3 is bought in new-state as it was a return from the B3-revision send-in. It's not tested on defects, but new out of the box. There's no issue with the RAM is it was taken from a working system and I have another 4 sets of DDR3 laying around which all functin perfectly fine. The GPU has been working without problems to date. So from my old setup, which had a Gigabyte GA-990FXA-UD7 and Phenom II X2 555 (@ X4 3,8GHz), I only changed out the mobo and CPU. The following problems occur: - When I start the PC a high tone (frequency-tone) is continually emitted from the CPU-area. It's like a tinitus sound (the one you can have after listening to some very loud sound). This tone does NOT occur when I remove the GPU (which of course had it's PCI-E cables connected and double-checked). - It seems the PC is endlessly stable in the BIOS. As soon as I Windows setup and the copying is finished so the PC starts unpacking, it doesn't take long (random time) and he PC resets. Only once it resetted before unpacking, but then I accidentally clicked the "Upgrade" option, but I'm not sure whether the PC registered this click. I'm sure nothing happened to my PSU in the meantime. I turned off the PC the normal way and directly switched out the mobo+CPU - no big downtime inbetween. Moreover, I disassembled and reassembled the previous AMD CPU+mobo at least 20 times last year, because of my review work. It's fairly impossible the CPU would be overheating as it hangs below 40c in BIOS and is under watercooling. What surprises me with this issue is that the CPU obviously isn't (completely) broken, but the sound seems to emit from it. Also the motherboard can barely be broken, as it's new out of the box. So up to this moment I reassembled the system twice to no avail. GPU in the second PCI-E gives same result. After a CMOS reset I got this message: "power supply surges detected during the previous power on. ASUS Anti-Surge was triggered to protect system from unstable power supply unit!" Anyone input on this, it would be greatly appreciated!! Thanks!