LED 8 should be green when the DIAG_ LED button is pressed, indicating that the main power is OK and within regulation. Plug in AC power cord, and press the power-on button on the front panel. LED 2 should be yellow when the DIAG_ LED button is pressed, indicating that trickle voltage is present.ĭiagnostic LED 8 indicates that the main power is OK and within regulation. If the computer still doesn’t power on, follow the procedure outlined below to determine whether the issue is related to the power supply.ĭiagnostic LED 2 indicates the presence of trickle power required by the logic board to begin the startup process. If the system fails to power on, first reset the SMC as described in this chapter.
To power on, the computer’s logic board requires “trickle” power.
I'm including this info for the benefit of searchers who come along in the future: PS - I've not done the following procedure yet, and because it is from the 2008 Mac Pro service manual it may not apply to the 2006 exactly as written. My experience is that the longer time disconnected is related to success, but I do not understand why. The famous and helpful "Hatter" once suggested to another troubled Mac Pro owner to "leave the computer disconnected from power overnight".
2008 mac pro power supply how to#
So any advice on how to improve our assessment of the true source of this problem would be much appreciated. To obtain a replacement supply here in Hobart is going to be difficult and expensive. The tech went off to consult for 10 minutes or so, then came back and said "we think your power supply is probably stuffed". I called Apple support, authorized a case. Shutdown, reinsert top rise, restart success. Yesterday I pulled the top memory riser, left MP off for 30 minutes then when I reconnected power I could startup successfully. Pressing down the SMC RST button stops this loop, but still cannot startup. When I reconnected power the MP began a familiar 17 second cycle, both sets of Memory Riser Card Diagnostic LEDs illuminate for about 3 seconds, fans start, shutdown (repeat). None of the usual voodoo worked, so I left the Mac Pro for about 6 hours with power and all cables disconnected. Sometimes just pulling the power cord for a few minutes works.
The straight forward "press the SMC Reset button" never works. I go through the SMC reset procedure as per Article: HT1806. Typically in the morning I see the Mac Pro has shut down and will not startup.
I ask because we have experienced several times over the past couple of years the following issue. Re: Mac Pro 2006, how do I assess whether the power supply is failing? It works fine.Įdit: Apparently the MacBook SMC Firmware Update 1.4 should fix the "L" style power adapter issue on older MacBooks.We're on our yacht in Hobart, Tasmania. They sent a new version of the old charger with the square mag safe connector. After having two new ones not work, I contacted tech support. If that doesn't work, you need to call Apple support to arrange for your power adapter to be replaced with a "T" style adapter:Īpple is aware of the issue with the pins being at a different depth in the new chargers with the "L" shaped connection. Re-install the battery and turn your computer on. Turn off your computer, flip over the laptop and remove the battery, hold down the circlular button on the battery for 10 seconds, the green light should go out. It seems that for some people, a workaround does the trick: However, there seem to be issue with "T" style (the old) vs. According to Apple knowledge base entry HT2346 the 85W power adapter is the right one.
0 kommentar(er)
