So, I have looked at a few forums for this topic and some threads would suggest that the mobo 'may-be' bad.
Intel E8400 Core 2 Duo Processor 3 GHz 6 MB Cache Socket LGA775
Intel DG45ID Motherboard - Intel G45 Express, Socket 775, DDR2 800/667 MHz
There is a high pitched noise/whining coming from the mobo, I believe to be from around the cpu or chipset area.
I have narrowed it down to the mobo by unplugging/removing everything I could down to just the psu main cable and the case power button. I started by removing/unplugging the fans, cd d, hdd1, hdd2, the ram then the cpu and all the misc cables (usb, audio, reset switch)
Pretty sure its not the psu because it is out of the case and ~1/2 foot away, also I tried another PSU that doesn't really fit the board at 20-pins but it turned on. At all points the noise continued, the computer boots to bios fine and the noise dampened once when i pressed down on the chipset heatsink..... I installed Win7 and the noise continues even then, however, it does change slightly and stopped 99% for about 2 secs without actually doing anything, I had also noted that the sound is intermittent, as in the signal is fully in/out. (currently connected to monitor via HDMI from onboard GFX adapter)
Greatly appreciate any thoughts and advice.
Edited by chuck4100, 21 May 2013 - 10:10 PM.