When putting music or pictures on pny 4gb mirco sd card from my hp pavillion dv7-1247d lap top than put card in my samsung sch-r451c phone it shows up on memory but can not see or play music. yes I first put card in phone to format then put in lap top to down load

in the memory section of the phone settings, choose copy phone memory to SD card.

http://www.samsung.com/us/support/owners/product/SCH-R451ZKGTRF

for your SD card music files, use a microSD card adaptor and copy from any netbook/notebook around. Usually, they have a SD card reader. If you dont have a microSD card adaptor, you can find one relatively cheap in any electronics store that sells cameras, pc's. laptops, etc.

You can, just hook your phone up to your computer vie USB cord. When hooked in, open phone go to 9. Settings & Tools then 2. Tools then 9. USB Mass Storagethis will connect the mirco sd card. PC under My Computer>removable drive open you should have folders listed go to My_Music, drag your mp3's to that folder. If using a Mac it needs to be a new Mac to recognize the mirco sd card, do the same steps as above and the mirco sd card will show up on the desktop as a drive.
jh3:16

2) How to put Slax on CD:
http://www.fixya.com/support/r3879348-slax_guide_survival_live_linux_usb_flash

Please try to back up the music and picture that you have on the memory card, try to format the card using the phone before transferring the music and pictures again. Try to consider the memory capacity of the card, make sure that it is compatible with the phone.

It's probably just that you aren't using the correct folders, but...

First, make sure you phone TRUELY sees it as it should. Some phones don't properly handle SDHC cards. As long as it's a picture phone, put in the card(blank and formated) and take some pictures. If you have a data plan, download a tune or two (sprint has "free sample" mp3 download of the week).

Now, take the card out, and access it with the computer.
You should see a picture folder, and a media folder(names depend on the type of phone you have)

Specifically, the music folder is where you want to put your music files.
Also, depending on your phone(you didn't say what kind you had) you should begin trying by uploading 128Kbps mp3 files. Most modern phones should handle that format.

Now, return to the phone, and test it out with either your "mass storage manager" app, or your media player app.

The samsung gravity does not support HC cards. I had the same problem and purchased a regular MicroSD card and it works fine. hope this helps.

I doubt that your phone accepts the 4GB version of the micro sd card, try the 2GB

Files must have the correct extension. i.e. .wav or .mp3 or whatever the music player requires. You may need to convert the sound file to a different type for the device to see it. It may show in one device and not another for this reason

well assuming you loaded music on your sd card:

to find it, just go to mystuff....

menu, mystuff, center button, it should load the mini sd right there. then all you have to do is click over right and file explore the mini sd. you should put music in the music file.

another option on the phone.....

go to att music

menu, upper left icon, center button, music player, it should find all files.

let me know how i can help some more