I can not transfer photos from my camera to my computer.

ALTERNATE WAY TO TRANSFER PHOTOS AND VIDEOS TO A COMPUTER
If your photos and videos are stored on the memory card, then remove the memory card from the camera and insert it into an USB memory card reader. Connect this USB memory card reader and memory card into the USB port of your working computer. Your computer will see this as an USB Mass Storage Device or an external storage device; you can then open the folder on the memory card and copy the photos to your computer. Then you can view them on the computer.
Memory card reader is a handy device and is inexpensive. You can copy photos from other cameras and you can also download photos off your memory card to someone else's computer without the need of installing any programs.

TRANSFERRING PHOTOS TO COMPUTER
If your photos are stored on the memory card, then removethe memory card from the camera and insert it into an USB memory card reader.Connect this USB memory card reader and memory card into the USB port of yourworking computer. Your computer will see this as an USB Mass Storage Device oran external storage device; you can then open the folder on the memory card andcopy the photos to your computer.Memory card reader is a handy device and is inexpensive. Youcan copy photos from other cameras and you can also download photos off yourmemory card to someone else's computer without the need of installing anyprograms.

Two options. One, leave the card out of the camera when you connect to the computer, then download the pictures. Two, use the camera's copy function to copy the pictures to the memory card, then download the pictures.

Consider NOT connecting your camera to your computer.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.

Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program, such as Picasa ( http://picasa.google.com ).

I have a card reader on standby for when the cord stops working. So far, I haven't needed it.

check your USB Data cable .. may be is bad or not working properly..
taken new cable and try...

For me also same problem No power ON Green LED blinks

As for iPhone Not Recognized in iPhoto issue, you can have a try the 3rd-party iOS data transfer tool - Leawo iTransfer to transfer photos from iPhone to computer. Just follow the below steps to do that.

Step 1. Run Leawo iTransfer and connect iPhone to computer with the USB cable. The software will recognize your iPhone.
Step 2. Click the name of iPhone and choose Camera in the left sidebar. The iPhone photos will display in the right part of the software window.
Step 3. Hold Command/Shift key to select the photos you want to transfer, and click the transfer button at the right bottom. Or right-click one selected photo and choose Transfer to > My Computer.
Step 4. After selecting photos, you'll see a pop-up dialog. Check Save to Folder and click Change to choose a folder on your computer to save the photos. Then click Transfer Now to start to copy photos from iPhone to Mac computers.
When the transfer finishes, you will get the photos in target folder. If you want to transfer photos which are synced from computer, you can choose Photos library in the left sidebar of Leawo iTransfer, and select photos to transfer. With Leawo iTransfer, you can easily copy photos from iPhone to Mac, and you are also allowed to transfer other kinds of files with this software, for example, you can transfer music from iPhone to computer with Leawo iTransfer.

For more details, check: How to Transfer Photos from iPhone to Mac

Try NOT connecting your camera to your computer.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.

Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use Nikon Transfer or any other photo management program such as Picasa.
Organize edit and share your photos

Depending on the model, to view photos on your iPod photo/"Color", you either need to import photographs using Apple's iPod Camera Connector, or transfer images from your computer through iTunes 4.7 or higher to the iPod. For the current iPod U2 Special Edition "Color", iPod "Color" (20.0 GB), the version of the iPod photo (60 GB) introduced on February 23, 2005 and renamed iPod "Color" (60 GB) on June 28, 2005, as well as the discontinued iPod photo (30 GB), the simplest way to transfer photos from many digital cameras to your iPod is to purchase and use Apple's iPod Camera Connector (US$29). This device simply allows you to directly connect a digital camera to the camera connector and in turn connect the camera connector to the iPod "dock" port. Photos imported using the iPod Camera Connector are immediately viewable, with the exception of RAW format images and video clips. However, photos imported using the iPod Camera Connector cannot be immediately viewed as a slideshow with transitions. On versions of the iPod photo (40 GB, 60 GB) released prior to February 23, 2005, photos transferred directly from a digital camera using an iPod-compatible media reader are not immediately viewable, but photos transferred through iTunes 4.7 or higher, which converts photos into a "thumbnail" format, can be viewed on the iPod photo itself or displayed using the iPod photo connected to a TV or projector. The iPod nano, introduced September 7, 2005, can display photographs on the internal display "loaded" from a computer, but as it lacks video out, it cannot display photographs on a television or projector. The iPod nano also does not support the iPod Camera Connector or third-party solutions, so photos cannot be transferred from a camera. For information regarding the iPod nano and accessory compatibility, please refer to Apple Support