4 Random kernel panics and slow downs
Hello, and sorry for the lengthy post (I'm trying to be as thorough as possible)!
My buddy has this early 2008 iMac that's been giving him trouble and since he doesn't have much cash to play with I offered to take a look at it for him.
Basically it starts slowing down at a random point and then, about 30-60 seconds later it reboots without warning. Almost as if someone pulled the plug for a split second.
I booted from MemTest86 5.1 and all the RAM (3Gb) checked out fine. As did the HDD in Disk Utility. I did a clean install of Mavericks and the problem persists.
I don't think this is relevant but, just in case... The 250GB HDD was oddly partitioned. 170GB for OSX and the rest unallocated. I erased everything before installing Mavericks so now it's a whole 250GB partition.
The crashes occur more frequently when I'm trying to do maintenance on the computer. It is impossible to install any software updates so we're stuck on OS version that came on the dmg I used. Also any diagnostics processes I launch usually result in a crash. Web browsing can be done for at least 30 minutes without an issue. It even crashed once when I attempted to boot from the Mavericks DVD, but the 2nd attempt went fine.
Holding down 'D' on the keyboard during startup does nothing.
When I look through the crash logs I see that the source of the crash is always the same: The processor became unresponsive. But the reason for it's unresponsiveness differs from one crash to the other. I'm thinking this could be fixed by replacing the CPU, but I've also heard of the GPU causing similar problems.
Overheating seems unlikely since it boots up fine immediately after each crash. And the time between crashes doesn't appear to relate to hot or cold boots.
I haven't attempted to decipher crash logs before so a second opinion would be greatly appreciated! :)
I'm going to post some of the crash reports as a reply to this question to prevent being blocked by the automated spam filter
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Most of the crash logs say something like this:
panic(cpu 1 caller 0xffffff80010c030b): "TLB invalidation IPI timeout: " "CPU(s) failed to respond to interrupts, unresponsive CPU bitmap: 0x1, NMIPI acks: orig: 0x0, now: 0x1"@/SourceCache/xnu/xnu-2422.100.13/osfmk/x86_64/pmap.c:2612
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BSD process name corresponding to current thread: mdworker
-The current thread varies, sometimes the mdworker, sometimes a kernel task and sometimes core audio....
alliat さんによる
Apple computer, especially iMacs in my xp hate odd amount of ram. try booting up with just 2gb of ram
Lord Vader's Finest Rocketeers さんによる
When u get a kernel panic, it almost always means ram
Lord Vader's Finest Rocketeers さんによる
So it could be the odd number of ram gbs ora bad ram stick. u can't do anything heavy with two gbs of ram though so it might crash. if that doesn't work, then try it in the other ram slot. u might want to get new ram as a last test, if all else fails.
Lord Vader's Finest Rocketeers さんによる
Not true, kernel panics usually indicate GPU issues (more likely in this case, since GPU failures are common in iMacs) and sometimes CPU. I have never come across one kernel panicking due to RAM, since it will usually not boot up in this case (beeping instead)
Reece さんによる
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