Google Drive v1.14 has been reported to mimic hardware failures with some MacBooks running OS X 10.6.8, including three beeps at startup and kernel panics.
It us unknown has Google Drive can cause boot failures, but one theory is that it writes something to the RAM which is accessed with the Mac gives POST. Many people experienced this problem have gone as far to replace RAM and motherboards, but the three beeps at startup and kernel panics persisted until Google Drive was uninstalled. See this growing user forum thread more details: https://productforums.google.com/forum/#!topic/drive/NVy9cxgkL_g
When this boot failure occurs, you can clear the PRAM/NVRAM to get the Mac to boot again temporarily without playing the three beeps at startup.
Google posted to one of their product forums on 3/27/14 “According to the information I received, the issue will be fix in a future version of the Google Drive sync client. We do apologize for any inconvenience this issue may have cause. We great appreciate your patience and understanding regarding this matter.”
I personally use a MacBook Pro running OS X 10.6.8, and have recently been experiencing a random kernel panic about one a week. Curiously I check my panic logs, and they began after I installed Google Drive a few months ago. So I went to uninstall it, and my Mac kernel paniced when attempting to disconnect my Google Drive account the first time (it worked after rebooting and trying again).
So until Google releases an update, if you are troubleshooting a MacBook Pro running OS X 10.6.8 that is either kernel panicing or playing three beeps upon boot, try uninstalling Google Drive. Uninstallation instructions are posted at https://support.google.com/drive/answer/2375081?hl=en