i have a pc with gigabyte ga 8i915g duo motherboard and intel 630 proc. last night i shut down my pc properly but today when i tried to on it nothing happened after pressing the power switch. after pressing the power switch even the power supply fan is not working . so i check all the connections but everything was alright. then i check my pc after removing all the divices as graphics card ,sound card and harddisk but nothing happened. so i checked my power supply on my friends pc and it is all right. then i checked my cabinets power switch with my friend's mobo and taht too is fine. now i m unable too find the fault with my pc. what can i do. what can be at fault proc or mobo. please help. one more thing i want to knw that my proc's box is missed but i have the bill . can i get it changed under warranty without the box if it is at fault. thanks in advance.