Thank you for contacting the Intel community.
The processor is supposed to boot with all cores enabled, if your system does not boot when enable all cores, several reasons can cause that:
- May I ask why you activated and deactivated the cores in the BIOS? Was this system working fine before?
- Was the system overclocked?
- Make sure the system is not overclocked; if the system was overclocked this kind of issues can happen.
- Miss configuration in the BIOS can cause issues like this, make sure to have the BIOS set to default settings.
- Try updating the BIOS for your motherboard.
I hope that can help.
There was a problem and computer wont boot. So i tried all different things.
So initially all core were enabled. After changing setting to just work with 2 core, Computer booted up.
So I just want to know what is wrong here.
And about other thing. Its not overclocked(Dell Motherboard, no option to overclock). I just update Bios. And also tried the default setting from bios.
Is this a system that you built or you purchase this system already built from Dell? If the system was purchased already built from Dell I strongly recommend contacting Dell for better support as they are more familiar with your system and how the components interact with each other.
I would have done that at first place but its out of warranty.
I tried the system with other processor (i3-2120) with default setting and it worked fine.
If you try your system with other processor and you don’t get the same behavior then you could have a defective processor. Did you purchase this processor separate or it came already installed in your system?
If you purchase the processor separate and it is a box unit you can try to request a warranty replacement at the following link:
Is there a Bios update for the motherboard?