Hi Hessy

is your control contaminated??? a little bit more details could help the community to guess what's wrong.

fred

the quickest solution is to move one of the primers outside of the amplimer then the contamination cannot amplify.

If you cannot do this then set up the pcr with another researchers reagents ,pipettes and working area and use a different pcr machine to see if you can get a clean reaction. If not then you may have to order the primers again and dilute them in another lab or at least another workers area and using their pipettes using TE and water from their stock not yours.Store small samples of primer to avoid dipping into the main stock of primer in case you get contamination agail. Be carefuk not to run the agarose gels near your working area and use gloves to habdle gels and discard the gloves in the gel running area not your work area as the running buffer contains your amplimer once it has been used

Thankyou mr. Paul  for your advice. I will try your recommend