Hhmm... Well, let's see....
It's been a long time since I used recovery=y, so I was stumped myself.
1. Hold shift.
[at the boot screen or immediately after the screen with the Dell logo]
2. On the screen with your hard drive name, type:
recovery=y & hit enter
3. Wait for OSX to load.
I did it on a Mini 9. (Hopefully it works all the same on a 10v.) Anyway, the system took a while to load, so I typed recovery=y again, but it had already worked the 1st time.
OSX loaded, & I was in there. Thank goodness. :-)
Please DON'T DO the following as it will not work!
What I was doing wrong before: Getting to the screen with my hard drive name on it, pressing the down arrow, selecting boot, typing recovery=y & getting stuck in the reboot loop.... DUH! XD