MP 1,1 cycling reboot

[1042686]

when I went to use my 1,1 MP running elcap this morning, I got an unresponsive black screen. Then when I went to reboot, I got no chime + black screen. At this point I reset SMC from which I did got a chime but then it just cycles over & over.

This is where I'm at now. Steps taken so far include:

SMC reset
Lobo reset
Ram dimm & card reseat
Monitor test (OK with my powerbook)
GPU reseat
GPU new PCIe slot
LED test button (located in ram bay) showed no CPU/Sleep warning LEDs. power and trickle were on as the computer was cycling.

So at this point, I'm sorta stumped so thought Id put it out to you guys for thoughts. I thought that as this is a hackered elcap install on a 1,1, that a corrupted file of some sort is causing it to hang and reboot (has been solid for the past 5 months) but am at a loss as to how to get the cdrom door open to install a more appropriate OS like SL or Lion. It is unresponsive via the keyboard.

Any thoughts on how to proceed? Thanks!

 

[flyinmac]

I’d suspect that perhaps the latest security update installed on you. So that’s where I’d check first. Look at the thread in here about installing El Capitan on the old Mac Pro. It’s discussed heavily in the last few pages of the thread.

The security update causes the problem you describe. And it is able to be fixed using the tips in that discussion.

 

[1042686]

I’d suspect that perhaps the latest security update installed on you. So that’s where I’d check first. Look at the thread in here about installing El Capitan on the old Mac Pro. It’s discussed heavily in the last few pages of the thread.

The security update causes the problem you describe. And it is able to be fixed using the tips in that discussion.

Thanks! Will do!

 

[flyinmac]

Thanks! Will do!

I found the description of the repair steps on page 155

https://forums.macrumors.com/threads/2006-2007-mac-pro-1-1-2-1-and-os-x-el-capitan.1890435/page-155

Probably start reading 10 pages before that I would guess to get the whole story if you want it.

Here’s the post describing the steps

https://forums.macrumors.com/thread...s-x-el-capitan.1890435/page-155#post-25748939