so how fucked is it now??

right now pc seems to run normally with power and fan works but it beeps 3 times every few seconds. nothing is showing up on monitor and its says its in power save mode but my keyboard and mouse arent working to get it out of power mode.

do i really need to replace the whole harddrive, itll cost about 400-500. if i am able to replace this motherboard thing it may not work anyway, so piss off .

any thoughts?