MP 1,1-5,1 Mac Pro 5,1 won't boot when attempting NVRAM reset

[ogiphone02]

Hello everyone, so today I decided to clean my Mac Pro and apply new thermal paste, did everything, turned it on I heard chime and I was like let me reset NVRAM, when I pressed keys nothing happened, turned it off and on again, nothing, no chime and black screen, checked all connections, checked CPU everything. Tried again and then it booted, I installed fresh Mojave, did all updates, turned Mac off and on 2 times everything is normal. Now I tried again resetting NVRAM
because I was curios and again no chime and black screen. Does anyone know what could be the problem. Thanks.

 

[tsialex]

Hello everyone, so today I decided to clean my Mac Pro and apply new thermal paste, did everything, turned it on I heard chime and I was like let me reset NVRAM, when I pressed keys nothing happened, turned it off and on again, nothing, no chime and black screen, checked all connections, checked CPU everything. Tried again and then it booted, I installed fresh Mojave, did all updates, turned Mac off and on 2 times everything is normal. Now I tried again resetting NVRAM
because I was curios and again no chime and black screen. Does anyone know what could be the problem. Thanks.

This happens when the NVRAM volume have one, or more, of the stores with a corrupt header, you should dump the BootROM image and check it, see the first post of the BootROM thread (How to check the health of the NVRAM/if the garbage collection is still working: ) for more info:

MacPro5,1: BootROM thread | 144.0.0.0.0

For MacPro5,1 BootROM upgrades, please read the first post of the thread below to know how to do the firmware upgrade: https://forums.macrumors.com/threads/mp5-1-what-you-have-to-do-to-upgrade-to-mojave-bootrom-upgrade-instructions-thread.2142418/ For MP4,1 to MP5,1 cross firmware flashing...

forums.macrumors.com

Usually is like this:

Could also be a module with wrong checksum, be sure that something is wrong.

 

[ogiphone02]

This happens when the NVRAM volume have one, or more, of the stores with a corrupt header, you should dump the BootROM image and check it, see the first post of the BootROM thread (How to check the health of the NVRAM/if the garbage collection is still working: ) for more info:

MacPro5,1: BootROM thread | 144.0.0.0.0

For MacPro5,1 BootROM upgrades, please read the first post of the thread below to know how to do the firmware upgrade: https://forums.macrumors.com/threads/mp5-1-what-you-have-to-do-to-upgrade-to-mojave-bootrom-upgrade-instructions-thread.2142418/ For MP4,1 to MP5,1 cross firmware flashing...

forums.macrumors.com

Could also be a module with wrong checksum, be sure that something is wrong.

Thanks for reply, did this few months ago, it had 44 something space free and I had all VSS stores. I barely used Mac. But I will check it again once it boots up. Should I check RTC battery as well or this doesnt have anything to do with it?

 

[tsialex]

Thanks for reply, did this few months ago, it had 44 something space free and I had all VSS stores. I barely used Mac.

Now you gonna check if all the stores are present, see the image in my previous post.

But I will check it again once it boots up. Should I check RTC battery as well or this doesnt have anything to do with it?

If the RTC battery is below 2.9V, you Mac Pro will behave crazily. Yes, you should check the voltage and replace it whenever is below 3.00V with a brand new Panasonic BR2032.

 

[ogiphone02]

Now you gonna check if all the stores are present, see the image in my previous post.



If the RTC battery is below 2.9V, you Mac Pro will behave crazily. Yes, you should check the voltage and replace it whenever is below 3.00V for a new Panasonic BR2032.

Alright I will do this tommorow, I spent whole day trying to boot this thing up and after finally booting it did nvram reset or atleast tried and now again no boot...

 

[ogiphone02]

@tsialex Hey man, got new battery and still same problem, tried booting with old GPU, nothing, tried pulling out ram nothing, tried pulling out cpu board and nothing. Idk what is happening, I doubt its NVRAM because it happened before when I did same thing, after that worked normally until yesterday.

 

[ogiphone02]

@tsialex I just applied some more thermal paste now because i took of cooler and it seemed like I didnt apply too much paste, now it boots, im scared to NVRAM reset xD, plus I didnt put rtc battery back. If i put it back it wont reset anything?

 

[tsialex]

Without the RTC battery, your Mac Pro is operating in a fail-safe mode that bypass the NVRAM, lot's of things now doesn't work, like sleep or any NVRAM related settings. The RTC battery is required for normal operation.

If after you install the RTC battery, your Mac Pro issues return, you have a corrupted BootROM.

 

[ogiphone02]

Without the RTC battery, your Mac Pro is operating in a fail-safe mode that bypass the NVRAM, lot's of things now doesn't work, like sleep or any NVRAM related settings. The RTC battery is required for normal operation.

If after you install the RTC battery, your Mac Pro issues return, you have a corrupted BootROM.

Hey, thanks, I put battery back and it boots fine.

 

[ogiphone02]

Without the RTC battery, your Mac Pro is operating in a fail-safe mode that bypass the NVRAM, lot's of things now doesn't work, like sleep or any NVRAM related settings. The RTC battery is required for normal operation.

If after you install the RTC battery, your Mac Pro issues return, you have a corrupted BootROM.

I also noticed there is no more kinda beep sound very low volume, it chimes and boots but this sound is not there anymore, its like memory beep