Jailbroken iPad stuck at boot screen and looping I have a jailbroken iPad 1 with iOS 4.2.1    


I replaced hosts file under /etc/ and resprang    
the iPad stuck at blank screen   
I restarted by pressing both power and home key  
Now the iPad is stucking and looping at apple logo booting screen


Currently,    


I can access the file system using iPhoneBrowser 1.9.3 and     
iTunes 10.2.1 recognizes the iPad. 
WIFI interface seems to be up but SSH is not up


Now, I have replaced the modified hosts with original file.     

Still the screen never reached the lock screen.    I doubt it is file system error and in this circumstances how can I check my iPad for file system error? Is there a way?

update 1


still stuck (have left it run out of battery)    
WiFi is not up.    
SpringBoard Crash log state that   

Reason:          Watchdog timeout: 5 crashes, 732.836304s since last successful ping   
Thermal Level:   -1    
Thermal Sensors: failed to load sensor values



update 2


upgrade to 4.3.3
restore with back-up data
all are working fine now
The obvious answer is to re-install the OS and then ssh in to run fsck.

Have you looked into a program like PhoneView that will let you mount iOS device as an external drive and use Disk Utility (if you have a Mac) or fsck? The FAQ for PhoneView has a windows software recommendation that does about the same things if you prefer that OS on the desktop.

(edit: I don't know of any free alternatives that mount the file system)