For the past week or so my computer has been working seemingly fine, but out of nowhere the screen go black and the speakers would make a buzzing noise. This happened every 25-45 minutes I was on my computer, and the only way to stop it was to turn the machine off. After dealing with this for a few days I reset my BIOS settings to default (I'm not sure if they were already on default settings or not) and now my computer won't boot windows. It displays a screen stating the last time windows booted it failed and asks my to boot either in startup repair (recommended) or normal. If I boot in normal it fails and shuts down again. If I boot in startup repair it doesn't detect anything. Can somebody give me some insight on possible issues?