cables have this labels LED+ LED-,HDD.But on tha motherboard where the cables are to fit into have no labels
sounds like the wires for the front panel, power button/hdd led lite and green power lite . you will need to look for a manual for the model of motherboard you have .
Lets find out what you have inside.motherboard model # ect ect .
Use Speccy to provide details of your computer's configuration.
Download, free speccy , http://www.piriform.com/speccy/download , install, and run.
After Speccy has finished gathering information, click File > Publish Snapshot.
Click Yes. A web address will be displayed.
Click Copy to Clipboard and paste it in your next post.
Include your computer's manufacturer and model number, if available.