i'm not completely computer savvy. i just pretty much bought an entirely new computer without buying a new computer. my motherboard died, so i replaced that ECS NVIDIA GEFORCE 7050M-M V.2.0. my processor was older, so i replaced that with an AMD ATHLON 64X2 (AM2 Slot). I got a new power supply maxes at 525. and a new dvd burner. my problem is that after i got it all hooked up, i get a message that says 'REBOOT AND SELECT PROPER BOOT DEVICE OR INSERT BOOT MEDIA IN SELECTED BOOT DEVICE AND PRESS ANY KEY'. my computer had not gone into windows xp at all since installing the new hardware. how do i fix it?