Chosen Solution
Weird sound then short electrical hum. Screen froze. Manual computer restart. Can hear it but monitor is black. Monitor check on another computer. Monitor is fine. Checked cables. Blew out dust. Tried different graphics card and nothing. Monitors - tried 3- still wont come on. Which hardware part could have blown?
Change psu, reset bios see if it works, check for visual damage on MB, use new 3v coin battery. Try leting system sit for a while with no 3v bat & -/+ shorted with a cable. See if with no ram or CPU the system beeps. If all fails could be a short/chip or vrm from MB.
