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I'd also suggest trying and booting up cold and using Safe Boot Mode.

At least that would eliminate any goofy non-Apple extensions. And also run Disk Utility to Repair permissions and Verify disk.
...seriously? Stop giving out bad advice. Permission and extension issues will NOT cause 3 beeps.
 

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Really??? Then I suggest you get in touch with The X Lab and let them know and maybe get them to correct their info!!!

Resolving Kernel Panics

General causes of kernel panics
Kernel panics are often caused by one or more of the following issues. ie:

- Incompatible, obsolete, or corrupted kernel extensions.
- Incorrect permissions on System-related files or folders.
etc. etc.

Or do you consider they don't know what they're taking about.

It seems to me from what the OP posted, he can boot normally and then get a kernel panic, and then after the next restart he can get the 3 beeps.

One would think that if the RAM were really bad and didn't pass its test, the three beeps would happen all the time, and especially with doing a cold boot.

Or maybe this guy was incorrect as well, and found the cause to be a dirty logic board!!!
MacBook Problem with 3 beeps (bad ram banks) Fix / Solution! - YouTube

That sounds odd as well, but it worked!!
Kernel panics are NOT the same thing as the 3 beeps. 3 beeps is a hardware issue, 100% of the time. 3 beeps means it's failing the POST, which means the OS isn't even loading.

There's no possible way that kernel extensions or permissions could cause it to happen.
 
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