Usb connection when I plug the player into the computer it reads usb connected, a few seconds later it says disconnected, I've downloaded the software from the CD and upgraded the media player to 11.

1. Please make sure your USB cable is working fine. better to connect your phone using another USB cable.
2. Change the phone's battery, or make sure its more than 80% charged and in good condition.
3. Try to connect with different USB Port on your PC.
Hope your problem will be solved.
thanks

it is not appering in my copmuters but it is charging.

1. Connect your ML648B to your computer with Windows XP or later.
2. By default your computer will recognize ML648B as GPX MTP Device. (Wait for few seconds to a minute allowing your Windows computer to recognize and install necessary drivers for the device for first time as MTP Device.)
3. Press the POWER button from top of your ML648B, to change it to USB mode connection. You will also see USB on the screen of ML648B. (Wait for few seconds to a minute allowing your Windows computer to recognize and install necessary drivers for the device for first time as USB device.)
4. ML648B will now mount 2 drives, one as Tools (as CD-Drive) and second as Removable Disk (Drive) – under My Computer on your Windows Desktop.
5. Double click & open Tools, and run Setup.exe to start installing Video Conversion Software tool.
6. Select defaults options and finish the installation by clicking on Close or Finish.
7. If asked, click on Continue Anyway on Windows XP or Install this driver software anyway on Windows Vista.

. Connect your ML648B to your computer with Windows XP or later.
2. By default your computer will recognize ML648B as GPX MTP Device. (Wait for few seconds to a minute allowing your Windows computer to recognize and install necessary drivers for the device for first time as MTP Device.)
3. Press the POWER button from top of your ML648B, to change it to USB mode connection. You will also see USB on the screen of ML648B. (Wait for few seconds to a minute allowing your Windows computer to recognize and install necessary drivers for the device for first time as USB device.)
4. ML648B will now mount 2 drives, one as Tools (as CD-Drive) and second as Removable Disk (Drive) – under My Computer on your Windows Desktop.
5. Double click & open Tools, and run Setup.exe to start installing Video Conversion Software tool.
6. Select defaults options and finish the installation by clicking on Close or Finish.
7. If asked, click on Continue Anyway on Windows XP or Install this driver software anyway on Windows Vista.
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Download the latest firmware upgrade from www.rcaopal.com to restore the player. The firmware upgrade file will be on the "Download Upgrades" section of the website.

-Tha Mp3 Doctor

1. Connect your ML648B to your computer with Windows XP or later.
2. By default your computer will recognize ML648B as GPX MTP Device. (Wait for few seconds to a minute allowing your Windows computer to recognize and install necessary drivers for the device for first time as MTP Device.)
3. Press the POWER button from top of your ML648B, to change it to USB mode connection. You will also see USB on the screen of ML648B. (Wait for few seconds to a minute allowing your Windows computer to recognize and install necessary drivers for the device for first time as USB device.)
4. ML648B will now mount 2 drives, one as Tools (as CD-Drive) and second as Removable Disk (Drive) – under My Computer on your Windows Desktop.
5. Double click & open Tools, and run Setup.exe to start installing Video Conversion Software tool.
6. Select defaults options and finish the installation by clicking on Close or Finish.
7. If asked, click on Continue Anyway on Windows XP or Install this driver software anyway on Windows Vista.

With the YP-u3 connected to the USB port and internet connected, start Samsung Media Studio software, you should get notification of a firmware update to download which fixed the recognition problem for me

Found the solution on another site (http://www.everythingusb.com/forums/showthread.php?threadid=11238). To quote user AFHavemann :

"* Plug in the player so the USB bus can see it.

* Once it’s recognized (i.e., the device screen reads "Charging" and "USB Disconnected"), go to the Control Panel and click "System"

* Choose "Hardware" then "Device Manager" tab.

* Look for the name of your device under “Portable Devices” in the list

* If the name of your player is under “MTP Device” then the correct drivers are probably loaded

* Right-click on the name of your device and click "Properties"

* Click “Update Driver”"

Then follow the prompts from there. The computer searches for the driver software, etc., and reinstalls/resets information related to the device, which fixed things such that the computer will now recognize the device. I'm not sure what causes the problem, but this solution seems to reset whatever's gone wrong.

this player is a piece of work ill tell ya i had to disassemble the damn thing resolder a piece back into it then it still dont work properly ill just tell u to get a new one or go with the ipod most pawn shops have them for really cheap these days

my YP-U3 player will not connect via my USB port. When plugged in to a port that connects my digital camera normally it first says on screen "USB Connecting" then changes after 2 to 3 seconds to "disconnected - Charging". it has fully charged and no change. I have checked the hold switch is disengaged. the media studio software is installed ok and the portable devices functions are greyed out. I cannot find the device on my pc. I am running Windows XP SP2. I will be returning it to the store where it was purchased very soon if i cannot find a solution. I notice there are a lot of people who have posted similar problems that have not recieved solutions.ya i have th same problem im using window xp 2