Core i5 650 core not active

Today i opened up HWmonitor just to check temps when i see it's only showing temps for core #0, So i check task manager and CPU-Z and they all show up as 1 core 2 threads...

I don't know how long it's been like this but in the BIOS I have it set to 'All Cores' and i have cleared my CMOS.

She's 1156 so she's pretty old. :) 

herlp meh plers

Sorry i couldn't be more specific but i Don't know why it is like this so i don't know what to suggest

maybe it's only a 1 core i5 with hyperthreading... dun dun dahhh!

Or they could be dead :(

zis it even possible for a core to "die" like that? thats really weird... i found this, though http://www.overclockers.com/forums/showthread.php?t=647307

Im not that stupid.

I have done what the person in the forum said i'll let you know what happens next time i reboot :)

yep, i had exactly th e same problem as the person in the other forum so sure enough my problem has gone too, thanks :)