Mac os x boot caches updating

Hello,after updating to 10.7.2 (from working 10.7.0) I get the Still waiting for root device error. And do you want to delete the kernel cache, or the Extension caches? How is it possible to enter terminal commands without a working installation?I cannot get past it, even with using different startup parameters (-f, -x, etc). I don't know about the kernel cache, but the extension caches can be done by deleting /Extra/Extensions.mkext Type rm -R /Extra/Extensions.mkext. I tried to boot from the installation DVD and start the terminal.

This "boot cache" is then used for satisfying incoming read requests, if possible.Simply hold down the D key while starting up your Mac to boot into the Apple Hardware Test.Sometimes on a Mac, the PRAM (parameter RAM) and NVRAM (non-volatile RAM) can become corrupt and cause various problems.There are times when your Mac may misbehave and refuse to boot into OS X.You may get a sad Mac face, an audible beep, or another ailment keeping your Mac from properly booting.

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This will force the system to run a drive check and clear some system caches.

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