Need help with iMac!

[absolute]

First forum post, hope I did not come to the wrong sub forum!

This afternoon, I updated my iMac OS to macos Sierra. Update went smoothly and after everything was set up and i was at my desktop, my cursor started to lag a bit and froze up every few seconds. Thinking it was a problem with my mouse i unplugged and plugged my mouse back in but it turns out it was actually the computer. This lag continued for about a minute or 2, then the iMac just restarted. It has went through loops and loops of restarts and I have no idea how to go about fixing this. 

Would greatly appreciate if someone could help me here!

 

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iMac 2011 21.5 inch 

[Miller1218]

I have the same I mac but it hasn't done that to me.

[fjdhdhcyfhf]

sucks to be you atm. what does dmesg say? thats if you can get to a terminal. you can also provide us with /var/log/system.log

[samiscool51]

10 hours ago, absolute said:

First forum post, hope I did not come to the wrong sub forum!

This afternoon, I updated my iMac OS to macos Sierra. Update went smoothly and after everything was set up and i was at my desktop, my cursor started to lag a bit and froze up every few seconds. Thinking it was a problem with my mouse i unplugged and plugged my mouse back in but it turns out it was actually the computer. This lag continued for about a minute or 2, then the iMac just restarted. It has went through loops and loops of restarts and I have no idea how to go about fixing this. 

Would greatly appreciate if someone could help me here!

 

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iMac 2011 21.5 inch 

it's a known problem, it happens because the processor is not powerful enough or you don't have enough RAM, what i did was load the Sierra installer onto a usb and did a fresh install to start off new and try and see if that worked, it did but your system might act differently...

[NelizMastr]

11 hours ago, samiscool51 said:

it's a known problem, it happens because the processor is not powerful enough or you don't have enough RAM, what i did was load the Sierra installer onto a usb and did a fresh install to start off new and try and see if that worked, it did but your system might act differently...

CPU can't be the issue since I haven't observed this on a Core 2 Duo Mac at all. If it's still on the factory 4GB of RAM, that's definitely a suspect. 

 

@absolute these models are also known for their crappy WD Blues crapping out. Your HDD might also play a role in this. The amount of r/w cycles involved with installing an OS might have tipped it over the edge. I hope that you have more than the factory 4GB of RAM by the way. 4GB isn't really enough anymore and hasn't been for a while in OS X.

[absolute]

thanks for the replies, but it turns out it was actually razer synapse. works fine now