expert mere pass dell gx280 desktop ka system hai, is 2 problems aa rahin hain,

1 kisi time us ka fan bohat hi speed se chalta hai aur display nahi ata

2 dosara us ki hard disk jab system khol kar chalata hoon to wo boot karti hai,
lekin jab us ka cover band kar k chalate hain to boot nahi hoti jab k bios
mein show hoti hai

kia koi expert help kar sakta hai