Mountain Lion works on my mid 2007 White MacBook. Look on YouTube on how you can do it

Is it possible to upgrade my MAC PRO:

1. Motherboard

2. CPU

3. Yosemite or El Capitan?

Could be a bad battery.. You can get them from Ebay

Hi there.

My iPhone 5 (model A1429) will not boot into iOS.

When the power cable is connected, the iPhone boots up initially and displays the apple logo for ~3.5 seconds. Then it goes to a blank screen for another ~2 seconds and the process repeats (indefinitely it seems - at least at this point).

When the power cable is removed, the screen instantly goes blank again. Nothing happens if I press the power button when the iPhone is not connected.

I can get the iPhone into recovery mode by holding the home button before I plug it in, and then it stays on the recovery screen, not coming on and off like the apple logo was earlier. Again, when I unplug the cable it goes back to a powerless blank screen.

The iPhone is detected on iTunes in recovery mode and I have attempted to restore it, using both my MacBook and a Windows PC. Each time, it results in an error at the point when the iPhone appears to restart. I see Error 2001 on the MacBook and Error 21 on the windows PC.

I've updated to the latest iTunes version, restarted the computer several times, and tried different USB ports.

I was also able to get the iPhone into DFU mode, where the screen was blank—but it was recognized in iTunes as being in recovery mode. Just as before, the device will not restore, and I get various error codes across my Mac and PC.

I have since opened the device up and confirmed that the battery is securely attached to the logic board.

It is also worth mentioning that my iPhone is no longer under warranty.

At this point. my assumption is that the battery itself is dead, and won't hold any charge, which is why the device shuts off immediately after removing the power cable. Does this seem reasonable and should I order a new battery? Any other suggestions?

Many thanks,

Bradley

In order to get the iPhone out of the Apple logo loop, you can try DFU mode as below:

Hold down the Home and Power buttons at the same time for 10 seconds. Then, release the Power button while holding the Home button for another 15 seconds.

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Hi guys,

I have an iPhone 6 was not turning on. After connecting to DCPS I noticed that PMIC heats up. I confirmed that PP3V0_NAND is shorted to ground and using alcohol method I confirmed that PMIC heats up first in that circuit. I removed PMIC expecting that I removed short to ground on PP3V0_NAND but it remained. When I inject voltage up to 3V none of the components heat up but my DCPS showscurrent consumptions. What is going on?

There are not many components on that line but visually they all seem to be OK and none of them produce heat.

My wild guess would be that via within PCB on that line got shorted and that’s why I could not locate it. What do you think?

Update (08/10/2018)

As I mentioned before initially PMIC was heating up as I thought it is shorted but after removing it I still have short on this line. I know what other components are on that line. My question is how do I determine which is faulty as none of them get hot when injecting voltage to that line.

Sanskar Patel on the Epson WF series that error code indicates a carriage fault. That can be caused by debris/obstruction (paper jam, bent/damaged rails, out of place purge assembly/wiper, or dirty/dislocated encoder strip) to a bad sensor or control board, faulty carriage drive motor/gear/belt, bad printhead/carriage pcb. also check the ink cartridge holder and make sure it is properly seated. As you can see it is a broad non-specific error code that will require you to check the aforementioned things first.

Is it okay to upgrade my laptop Asus X401A (with Intel Pentium B970 processor) memory from 2gb to 4gb? When upgraded, will it process faster?