We don't generally throw away power supplies because they are dusty. On older Macs, it was strong enough when dead, to pull down Trickle Power and keep the Mac from turning on the fans and getting going. The non-recharging nominal 3 Volt long-life lithium coin cell needs to measure near 3 Volts in your Hand, or you need to set it aside while debugging. It comes on as soon as the cord is plugged in, which can be startling if it arcs or crackles at the plug while plugging it in, machine off. It is also used by certain slot cards to maintain their internal state during sleep modes.
If you had faith in your power button, press and hold the power button for a quarter minute with the AC cord removed does the same thing as leaving overnight - drains the power capacitors for a good strong reset to all components, especially the SMC.ĥ Volt standby power is required to start the machine. So the procedure of leaving it off power overnight (AC cord removed from the wall outlet) lets the power capacitors COMPLETELY bleed down. Since there may still be a residual charge in the power capacitors, this does not always work if you try to start it up again right away. The way you do a SMC reset on these computers is to completely remove AC power. If it fixes the problem though, it would be better than the computer going in the trash. I'm seeing 2009 Mac Pro Power Supplies on eBay for about $150-200 which is more than I wanted to spend since I was planning on selling the computer for $700. If it's a logic board fail, will the entire system be completely unresponsive? I.E. Does this mean that the Power Supply is working and it may be a logic board fail? I troubleshooted that it might be a Power Supply problem, so I took that out and saw it was completely covered in dust.Īt this point - what would be the next step? Replace the Power Supply? I can't find any documentation online that says what that "5V STBY" Led means. Tried again and now the computer is completely unresponsive. I figured it might be a dust issue, so I unplugged and dusted the components. THIRD HOUR - Tried another force restart and the RED light came on. I started it up yesterday, and this was the chain of events.įIRST HOUR - Worked fine. I'm having a problem with my old 2009 Mac Pro that's been sitting on my shelf for about 3 years.
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