I use my pc for ages(days, weeks etc) with no problem. Turn it off one night then on the next morning. It then keeps coming up with the prob of NTLDR missing. When this happened before(through searches, I found a message I posted a month ago re NTLDR) and it turned out the boot priority had been changed. This happened again a couple of days ago and have now just remembered what caused it. Sure enough, I went into bios and it was the same thing again. I boot of my SATA drive and use my other 2 IDE drives as storage.
Any idea why my pc randomly causes my boot priority to be changed?