do not use rom manager. it is unreliable,and it is an APP in a working ROM,and as youve discovered,as such will not always be available to you.
if you have any PG05IMG files on your sd card,youll need to get a card reader,put the sd in your pc and remove it. then:
-remove the phone battery for a few seconds,repalce it.
-hold vol down,then power,and hold both until the hboot screen apears(white with colored writing)
-after some green writing flashes and disapears,select recvoery with the vol rocker and power button. this should take you to clockwork recovery
-wipe cache and dalvik cache(found under the advnced menu) and see if your phone will then boot
if it wont boot,then repeat the above process. this time,wipe cache,wipe dalvik cache,and wipe data/factory reset.
now you can either:
1)restore a backup
or
2)flash a new rom(you can mount usb storage from recovery,or you can use your card reader to get a rom onto the sd card)
for a rom,id highly suggest j rockers rooted stock rom listed a couple posts down to get you back to a working phone. afterward,yuo can search on xda or rootzwiki for roms youd like to try out.
flash them manually,using recovery. always make a backup of a good working rom in case you need it,or in case you simply dont like the new one.
Thunderbolt Android Development - xda-developers
Thunderbolt Development - RootzWiki