Give your Mac a few seconds before turning it back on. Fan speeds are: CPU 1200rpm, HD 1217rpm, Optical drive 699rpm. To turn off your Mac press and hold the Power button and wait until your Mac shuts down. My temperatures seem normal, mostly around 45-50 degrees, max 53 degrees for the HDD down to 24 for Ambient. I have used 192 GB of 297 GB capacity, roughly 66%. Purchased March 2009 so warranty has expired. Often a grounding rod stuck into the ground or strapped to the metal water line feeding the building. Make sure the buildings Ground circuit is in good shape. Hardware UUID:đ551B843-5D73-50DE-A338-D57C52C131D4 Following the wiring back to your fuse/breaker panel make sure you have a 20Amp circuit for 120volts and ideally you should have a dedicated line for your computer and your peripheral gear. Once it has frozen for more than a few minutes I have no option but to power off and wait an hour, if I try sooner I run the risk of getting the flashing folder at start-up. The longest i have lasted using apps is about 30 mins. If i simply use the internet it may keep going for an hour or two without freezing, but whenever I attempt to increase usage by accessing applications or even just the Finder it quickly locks up. It's usually okay for anything up to 15 mins after I have switched on but after that it depends on what i am doing. Open the Mac App Store app > then click Updates (left menu) and click Update All Furthermore, restart your Mac in safe mode for Symptoms. iMac still locks up frequently, but a clear pattern is emerging.
For around 7 seconds, hold the keys & use the Power button as well along with the keys (for 10 seconds). Since posting above I have upgraded RAM to 4 GB but it has made not a jot of difference. To do so, you need to restart your mac & use further mentioned commands ( Shift + Option + Control key) as soon as the system starts the booting process.
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