How to solve overheating, fans and not waking from sleep?
So since I installed Lion, I have the following problems with my MacBook:
1) overheating: often over 100ºC
2) fans over 6000 rpm even with temperatures <70ºC
3) often mac does not wake from sleep or does not go to sleep
I did a HardwareTest and got the following error:
I have resetted SMC, PRAM and NVRAM. The NVRAM reset seemed to help but after about 30min/1h the overfanning reappeared.
This is definitely a problem connected to Lion, but I can't go to the shop because my guarantee is over. I thought maybe updating Lion to its newest update (the 1GB update in the beginning of Feb 2012) would solve the problem, but it didn't.
I don't know what to do anymore. I read somewhere that maybe I should reset the PMU? I'm chickening out because it seems dangerous (that something in the Mac could be destroyed).
Could someone please tell me how to solve this problem?
Thank you SO MUCH.
PS. regarding the sleep, I think my computer is seriously confused, because when it goes to sleep, the light (white one in front of the Mac) gets turned on, and when I open the Mac, the light gets turned off.It's like it goes to sleep with the lid open and wakes up with it closed.... :/
PS2: I have a Macbook late 2008, 4GB memory, 2.4Hz
You'll need to look at what is using up your systems resources (running wild).
Sounds like something is not compatible with Lion, if you didn't have this problem before.
Do you have another HD you can do a fresh install (clean drive)? If so, set it up with Lion and restart your system booting from it. Still having problems? If not you have background app on your original disk that is the cause.
Check your system for background apps like antivirus, AntiSpam, Peer to Peer or application pre-loaders (MS has a few). Make sure you've upgraded all of your primary apps and removed any that you won't be using any longer.
Using Activity Monitor you can monitor whats running click on %CPU column to see whats the killer. WARNING: Quitting a process can make your system unstable so make sure you don't have any file open that you can't replace. Comparing a clean install Vs your running system can help you in isolating the normally running Apple OS processes as ones not to touch.
Also check network activity in case your system got zombie'd by some malware that for some reason kicked in after you installed Lion (nothing should be going across the net)
The fact your system won't sleep or wake is related to something running wild.
I've been having the same problems on my machine. (Macbook 2,4 Ghz 2008) What did the job for me was to restore disk permissions and do a restart. Sometimes waking and sleeping doesn't work like it used to, but it works like 90% of the time, so definitely a improvement.
Love to hear if this helps.
Greetings from the Netherlands,