IMac running 10.9 not rebooting after network issues

This is weird, and while I am going through Apple's Knowledgebase steps - so far without success - I thought I'd post here to see if anyone else experienced a similar issue.
I was having network issues (or what I think/thought were network issues) for about a week. The symptoms looked like high packet loss, i.e. websites would simply not load reliably: sometimes not load at all, sometimes load partially. This started with some smaller websites and eventually it failed to load google and facebook. It took me some time to notice that other devices on the same WiFi did not have this issue, so yesterday I decided to reboot my iMac. Network diagnostics didn't show any issue and I was able to connect to the WiFi router just fine, just not find any websites, so I thought a reboot may fix it.
I have not been able to boot it back up since. It stalls at the grey loading screen with Apple logo and a spinning wheel for ever (I've let it sit for hours). Safe boot does not work, and starting in Verbose mode hangs at "executing fsck_hfs" and it doesn't seem to do anything else. I've booted from the install disc (actually a USB drive) and ran Disk Utility from there, but it showed not disk errors at all. It did repair a handful of permissions (I only saw iBooks related stuff and something about etc/apache2/users), apparently successfully, but it's still not booting.
Disconnecting my external Time Machine drive and unplugging the iMac from my surge protector didn't help, either. I am now creating a new image from the partition just to have an additional backup on top of my Time Machine, and I'm going to try Archive and Install next, which is the next to last step in the Knowledgebase.
I do have two partitions on the Mac (one 10.9 and the other 10.7), by the way, and booting into the older partition seemed to work right away. It's just that I don't have any use for that other partition right now, it's a leftover from back when I migrated to Mavericks.
I am baffled how all of this connects together. Network issues, boot up failure without apparent disk issues? Has anyone else seen anything like this?

I am still working on restoring my iMac with 10.9.
I've cloned the affected partition. I used Disk Utility and it Restored without apparent unto an external drive. So I tried booting from that drive, but I get the same result as booting from the partition directly. Not a major surprise I guess since this is supposed to be an identical copy.
I have also created a dmg image out of the partition, and I was able to open that on my MBP without problems! All the files seem to be there. It seems to be something specific with the, uh, boot sector or, uh, something?
Next, I booted into Single User mode and ran fsck -fy. The Knowledgebase says it's okay to do it if Safe Mode doesn't work, right? The first time it ran, I got conflicting results. It said both
** The volume appears to be OK
**THE VOLUME WAS MODIFIED**
The Knowledgebase seems to suggest that it should only say one or the other?
Running it again, it said
** The volume appears to be OK
Alas, rebooting it still doesn't work, it continues hanging at the Apple logo.

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IMac running 10.9 not rebooting after network issues

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