Hey all!
I was having this same problem after only having my 60CSx for 3 days! One day I was praising it and the next I wanted to smash it into tiny pieces! Today when I turned it on to go caching the satellite page just came up blank except for "Locating Satellites" no bars, no icons, no nothing. I let it set for awhile to no avail. I tried the menu options for New Location, GPS on and off and turned the unit on and off several times. Nothing worked. I called Customer Service and they tried a couple forms of press this button while holding that button and power up at the same time....... nothing. OK OK OK OK Hold this button and this button and stand on one foot while you power up.......nothing. OK OK OK OK Tap this button, while holding this button, power up while running in ever decreasing circles........nothing.
Then I read this thread and took the advice with down loads / updates on-line and whamo! She is up and running again. I don't know how it dropped all the software and firmware, but it did. I can't wait to get out tomorrow and get some caches. I was going into serious withdraws.
Cache on!