I have asus p5kpl motherboard few days its detecting my harddisk but now it doesnot what to do...??

Solution
First you need to establish if it's the hard drive that's causing the problem, by testing it with the manufacturer's diagnostic software for DOS which loads from a bootable CD.

For WD hard drive, the link to the CD Image (ISO file) is here: http://www.smartestcomputing.us.com/topic/63494-looking-for-western-digital-data-lifeguard-iso/

For other makes of drive the links are here: http://www.tacktech.com/display.cfm?ttid=287

Download the appropriate CD Image and create a CD from it with IMGBurn on any working computer: http://www.filehippo.com/download_imgburn

Then boot your faulty computer from that CD and the testing software will open.
First you need to establish if it's the hard drive that's causing the problem, by testing it with the manufacturer's diagnostic software for DOS which loads from a bootable CD.

For WD hard drive, the link to the CD Image (ISO file) is here: http://www.smartestcomputing.us.com/topic/63494-looking-for-western-digital-data-lifeguard-iso/

For other makes of drive the links are here: http://www.tacktech.com/display.cfm?ttid=287

Download the appropriate CD Image and create a CD from it with IMGBurn on any working computer: http://www.filehippo.com/download_imgburn

Then boot your faulty computer from that CD and the testing software will open.
 
Solution