salam dear expert mere pass hp compaq dc7100 sff pc hai kuch arsay sa us main red light ka masla aa raha hai jab bhi power on karo laga tar beep k sath red light jalti rehti hai power supply aur ram hard disk aur battery cell waghera main na doosare pc par laga kar check kar liye hain woh theak hain please ess maslay ka koi hal ho tu zaroor batana kiyun k mujhe yqeen hai hai k mere maslay ka koi na koi hal zaroor ho ga.inshallah wslam