Ive got a iMac USB problem

Try turning off the computer. Other than that I'm not sure. I don't have the hardware and software in front of me so am unable to give a more informed answer

I believe the point of the message is to not disconnect a "live" connection at all.

BTW are you talking about a digital camera? Try turning off the computer. Other than that I'm not sure. I don't have the hardware and software in front of me so am unable to give a more informed answer.

When you connect a camera card via Card Reader to a USB port on your iMac, a disk image should show on the computer desktop. It (should) show as a small white rectangle, with the name Untitled beneath it. iPhoto usually opens automatically so you can edit or otherwise deal with the photos on the camera card.

When you've finished editing/viewing your photos, quit iPhoto. Next, drag that Untitled (it may have a name) disk image to the Trash which will change its appearance to an upward arrow with a block beneath it (the symbol for Disk Eject). This procedure will unmount the camera card correctly from the iMac and you should not get the warning message.

Another way to unmount a disk image is to R-click the image and then L-click Eject xxxxx.

One other thing - the MacOS is a bit precious about releasing items mounted via USB so count to ten before pulling the USB connection from your iMac.

nothing will happen. it just says that just make sure all ure usb files are closed. it is just a warning

hi tracynet,
when you will remove the usb just go down to the right of your screen and you will see safely remove,then click on it and just wait a few seconds and you remove it my dear,or else just switch off your pc and then you remove it