Thanks for the concern and thank God we are not much affected by Typhoon Haiyan. It's truly heart-breaking to see the condition of the people in Tacloban City Philippines. suffering physically and emotionally from shortages in food, water and shelter. We are very thankful from all the aid coming from the different nations around the world including the USA.
As for my iMac, i tried lowering the brightness to it’s lowest level but same issue occurs. I don’t have an external display to check if it also goes out with the main display but i’m sure, whenever the display goes out, it’s under sleep mode because the fans stop working and the mouse light turns off. it takes long to wake up and i have to press anything on the wireless keyboard just to wake it up.
As for the Apple Hardware Test, I would have to buy a USB keyboard coz i read somewhere that i need to use a USB keyboard to perform it. I can’t seem to enter AHT using apple wireless keyboard (Pressing and holding D key while turning the iMac on)
I installed SMCFan Control and increased the fan speed and temp right now in 42 degrees Celsius but the issue still occurs.
Its just so curious why the issue would only happen whenever I unplug my iMac. After I restart it the issue goes away but for a long period of use the machine freezes. the issue will also occur when the iMac wakes from sleep mode.
To verify wether this is an issue with the thermal sensor or some software glitch with mavericks, i have to get a USB keyboard to do the AHT. Thanks much..