Anilbro, just having a stellar GPA is not enough...It is one of the major factors that is looked for in a resume but internships and extracurricular activities are often perceived in similar importance (if you are a fresh graduate).  All I'd suggest is that you fix up your resume (as you have an excellent GPA) and resend it all around.  Also, get yourslef an equally convincing cover letter as well.  The format and material for these can be found on numerous websites.  All the best.