Hard disk not getting detected

Clarifications

hi i think it's mainly SMPS prob replace ur SMPS n chck it 1ce i think it wil work properly 'coz i do hav same prob but wen i replaced SMPS HD detects ..getting power frm SMPS to da HD power plug is da main thing,,,u do it bye

I'm having the same issue on an older HP desktop. It will randomly give me "No OS found" at startup, but I just fiddle with the connection to the HD, and it boots fine, sometimes after several tries. I changed to a new IDE cable, but it still happens--it happens with a new hard drive, AND with an older one. Now, it's possible I had 2 defective IDE cables, but one should check the pins on, both, the IDE connector on the back of the hard drive, and on the connector to the mobo (pins could be bent or LOOSE). A loose pin could require soldering. You could try connecting the hard drive to a DIFFERENT IDE connector on the mobo (that's one thing I'm going to try)--I'm not sure if that would work, but why not? You could switch and connect your optical drive(s) to the other socket, or just use one as a slave on the other ide channel. Hope this helps!

It could be that the CMOS battery is dead, and the BIOS has lost its settings to detect the hd. Were there problems with the computer not keeping the correct time before this happened?

check the position of the jumpers on it
so it will be placed in the bios

And test it with that.

Please post back if you have more problems or questions.