Some more info:
When I type startx from the rescue root prompt I get the following:
(I am typing this from across the room)

/dev/sdc5: recovering journal
/dev/sdc6: recovering journal
mountall: Event failed
/dev/sdc6: clean, 427752/12214272 files, 3819951/48843616 blocks (check after 
next mount)
/dev/sdc5: clean, 19912/3311280 files, 1755402/13239560 blocks
fsck from util-linux-ng 2.17.2
/dev/sdb1: recovering journal
/dev/sdb1: clean, 77144/122101760 files, 28000372/488378000 blocks
_

Where the "_" is the underline cursor prompt.  That is the last thing that 
appears.  After that, the system appears to be frozen.
Alt+F1, Alt+F2 does nothing, system completely unresponsive.  Not even 
<CTL><ALT><DEL> works, but I can ssh into it from the other machine.

Interesting: from the ssh prompt, top shows Xorg taking 100% of the
CPU?????

Tasks: 214 total,   2 running, 209 sleeping,   3 stopped,   0 zombie
Cpu(s): 13.4%us,  0.0%sy,  0.0%ni, 86.6%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  12323972k total,   597660k used, 11726312k free,    57728k buffers
Swap: 25165780k total,        0k used, 25165780k free,   160516k cached

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND             
                                                                        
1841 root      19  -1 76136 6680 4988 R  100  0.1  14:45.93 Xorg            

I could reboot from the ssh shell.  
Something else I noticed that I must have missed before:
The white dots all turn orange one at a time, then they turn white one at a 
time, then they turn orange and stay stuck that way once all 5 are orange.

On a normal (non rescue) boot, running top from a ssh shell shows that
Xorg is burning up the CPU:

top - 23:22:12 up 2 min,  1 user,  load average: 1.28, 0.70, 0.27
Tasks: 257 total,   2 running, 255 sleeping,   0 stopped,   0 zombie
Cpu(s): 11.4%us,  0.0%sy,  0.0%ni, 88.6%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  12323972k total,   531760k used, 11792212k free,    37824k buffers
Swap: 25165780k total,        0k used, 25165780k free,   105428k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                           
 1431 root      20   0 76136 6672 4984 R  100  0.1   2:21.86 Xorg               
                                                                           
    1 root      20   0 23832 2016 1272 S    0  0.0   0:01.52 init               
                                                                           
    2 root      20   0     0    0    0 S    0  0.0   0:00.00 kthreadd           
                                                                           
    3 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/0        
                                                                           
    4 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/0        
                                                                           
    5 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/0         
                                                                           
    6 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/1        
                                                                           
    7 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/1        
                                                                           
    8 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/1         
                                                                           
    9 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/2        
                                                                           
   10 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/2        
                                                                           
   11 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/2         
                                                                           
   12 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/3        
                                                                           
   13 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/3        
                                                                           
   14 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/3         
                                                                           
   15 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/4        
                                                                           
   16 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/4        
                                                                           
   17 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/4         
                                                                           
   18 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/5        
                                                                           
   19 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/5        
                                                                           
   20 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/5         
                                                                           
   21 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/6        
                                                                           
   22 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/6        
                                                                           
   23 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/6         
                                                                           
   24 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/7        
                                                                           
   25 root      20   0     0    0    0 S    0  0.0   0:00.00 ksoftirqd/7        
                                                                           
   26 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/7         
                                                                           
   27 root      20   0     0    0    0 S    0  0.0   0:00.00 events/0           
                                                                           
   28 root      20   0     0    0    0 S    0  0.0   0:00.00 events/1           
                                                                           
   29 root      20   0     0    0    0 S    0  0.0   0:00.00 events/2           
                                                                           
   30 root      20   0     0    0    0 S    0  0.0   0:00.00 events/3           
                                                                           
   31 root      20   0     0    0    0 S    0  0.0   0:00.00 events/4           
                                                                           
   32 root      20   0     0    0    0 S    0  0.0   0:00.00 events/5           
                                                                           
   33 root      20   0     0    0    0 S    0  0.0   0:00.01 events/6           
                                                                           
   34 root      20   0     0    0    0 S    0  0.0   0:00.00 events/7           
                                                                           
   35 root      20   0     0    0    0 S    0  0.0   0:00.00 cpuset             
                                                                           
   36 root      20   0     0    0    0 S    0  0.0   0:00.00 khelper            
                                                                           
   37 root      20   0     0    0    0 S    0  0.0   0:00.00 netns              
                                                                           
   38 root      20   0     0    0    0 S    0  0.0   0:00.00 async/mgr          
                                                                           
   39 root      20   0     0    0    0 S    0  0.0   0:00.00 pm                 
                                                                           
   40 root      20   0     0    0    0 S    0  0.0   0:00.00 sync_supers        
                                                                           
   42 root      20   0     0    0    0 S    0  0.0   0:00.00 bdi-default

-- 
Lucid Lynx 64 bit nightly build hands on boot
https://bugs.launchpad.net/bugs/552644
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