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Put the riser cards in today, also adding 8gb of RAM to the piddly 4gb I had. First noticeable difference was the Finder came right up instantly. Before, it took a good minute to open a folder or hard drive. Got the riser cards and RAM on eBay and they look absolutely brand new. 3 day delivery...

Mac Service guy said could be the graphics card but most probably the Riser Cards. I see on eBay I can buy 2 riser cards with some RAM for around $50. That's the cheapest way to start. Better than buying a graphics card for $150+ and find out it's the riser cards.

Well, I have the thumb drive working as a start up install drive and my Mac still will not keep running long enough to install the system. I talked to a Mac repair man who said it may be the riser cards or the GPU. I guess I’m done fussing with it and it’s time to take it in for service.

Thanks, DeltaMac! I thought there had to be a special process to get the thumb drive bootable. That is easy to follow.

I will do that on my work Mac tomorrow. Actually yes it did download. Can I put it on a 16gb flash card with a USB card reader or does it need to be a thumb drive?

Thanks Cheryl. I downloaded the file and the Mac wouldn’t stay running long enough to complete the install. I took a video with my iPhone that shows what the screen looks like when the freeze starts in but I can’t attach it here. Maybe that would give a clue as to what’s going on. Maybe this...

TeamViewer went just over 2 hours before I froze up and shut down. I was thinking of totally removing Firefox and Safari but now with TeamViewer locking up, I’m thinking maybe my system is corrupt. I may have to buy an El Capitan disk and do a clean new install. My nephew installed the system...

Figure this one out. I freeze up when using Firefox or Safari. But I’ve been on TeamViewer with my Mac at work for a couple of hours just fine.

Ah c’mon Cheryl. You’ve always had something to input. You’ve helped me out a couple of other times Tonight I was rebooting in Restore mode, attempting to reset Home Directory Permissions and ACL’s. Figured with all this rebooting it wouldn’t hurt anything. The screen started flickering like...

I’d really like to close out this thread! It seems the crashing is narrowed down to whenever I use either Safari or Firefox. I can be using illustrator, photoshop, indesign, whatever I need for commercial printing and design work. But once I get on the internet, give it maybe 3 minutes and bam...

Breaking news! I found a couple of extensions that a trial VPN service had installed - tap.kext and tun.kext. Apparently they were auto loading something into the ethernet settings on every bootup. I removed these 2 kext files and have been running on Firefox, iTunes, TeamViewer for a couple of...

Rember ran through and all RAM was OK. Now, is there a good app to check the Ethernet card? One thing at a time I (we) might get this figured out. One thing I have noticed is the system prefs need to be rebuilt every other day. I don’t have an El Capitan install disk to do a clean install...

I stumbled upon Rember. I will run it tonight and see what I can find out. It’s supposed to have the same programming code as memtest and mentions Memtest in the documentation.

I turned all fans to max for maybe 5 minutes and did not see much change before and after. I should mention that I only have 2 sticks of RAM so would those super high readings be coming from the empty slots? Don't know. Can a dual processor run with just one processor? Can I unplug the one? Here...

This is the HWMonitor just before carshing yesterday. I had raised fan speeds to see what, if anything, they may do if the back end of the Mac was overheating.

My panic report says panic(cpu 2 caller…). Is it cpu2 causing my problems?

Thank you Doctor X. Definitely something I will take a look at. I’m running into dead ends and might just have to spring for having it analyzed at at MAC service center

I did as much cleaning as I could and did pull the video card, got the outer shell off, and dusted pretty well around the fan and heat sinks with canned air. I removed the fans, both front and back, and give them a good cleaning. I guess my concern with the readings I got from HW Sensors wasn’t...

Hey DeltaMac, I’ve been reading about possibly speeding up the fan speed towards the rear of the Mac to cool down the video card. From what I’ve read it’s helped with the screen freezing and crashing. Any thoughts on this tactic?

Power Supply Consumption wavers between 138W and 200W, especially when I launched Firefox. My MacPro 2012 at work stands steady around 100W. Power Supply Voltage holds around 12.125V. Not sure what I should be looking for. I'll see if the user manual has a table of nominal settings.