The phone is designed to only hold a 2gb card. this is because a 4gb card uses high density memory the phone software can't read. There is a hack out there that I learned about at heliocity.net but it did not work for me.
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Most PCs are like that. I don't know what it is but the computer won't do it for mine neither. To put music and such on you sd card for your phone you must format the card while it's in your phone. Goto setting, Memory, Card memory, then click on opions. From there it will say "Format Card". Do it and the lock code is the last four digits or your phone number. After that's done to load music and such you put the sd chip onto you computer and transfer music to the folder on the sd card called "My_music", pix to "My_pix", and so on....
I have this phone to. I remember reading a long time ago, sorry I can't source it, but anything over 1gig the phone will not recognize. I have had 1gb sandisk and 1gb Lexar in my phone no prob. Try getting a smaller size card.
it might not work because as i know the maximum external mem that you can put in sch-u740 is just 2-gig micro sd... that's why it won't work and there were times that it might shut down or turned off automatically....
type 277634# * # (no spaces) click port setting click mass storage click mass storage remove go back to main screen and check again for memory if this doesnt work,take out memory card and try without the memory card.