Failed Startups, System Freezes+restarts, And More?

When I boot up my computer, things start smoothly. My mo-bo flashes and my BIOS Setup is available. Once on the "Starting Windows" screen with the pulsing windows logo, about 10 seconds in the screen will freeze. After staying frozen for a moment, the screen goes dark and my monitor reports: Quote: NO SIGNAL DIGITAL At this point my machine is still running; LEDs, Temp. readout, fans, etc. still function as normal. Motherboard reports no error. My only option is to force a shutdown or restart. Once I do, things start over.Mobo flashes, and now instead of the 'Starting Windows' screen, I get an error message reading:"Windows failed to start. A recent hardware or software change might be the cause. If windows files have been damaged or configured incorrectly, startup repair can help diagnose and fix the problem. If power was interrupted during startup, choose start windows normally."My options are:Launch Startup Repair (Recommended)Start Windows Normally.If I start Windows Normally, it goes straight to the 'Starting Windows' screen, where it often will freeze once again and follow up with a 'No Signal' message. Occassionally, it will not freeze and make it to the Windows Log-in screen (hurray!). Punching in my password takes me to a 'Welcome' screen with a swirling blue circle, and this page will often freeze, the screen goes dark, and 'No Signal' appears. Only on a rare occassion will my system actually start Windows, load my desktop and start-up programs. When it does, my computer will run anywhere from 15 minutes to a couple hours until it will lag, freeze, go dark (No Signal), and force a restart.

Instead, should I choose to Launch Startup Repair, I end up with a 20-minute scan that reports Startup Repair cannot fix the issue automatically. The report (for whatever it's worth) it supplied with my last attempt is as follows: Quote: Problem Event Name:

StartupRepairOffline
Problem Signature 01: 6.1.7600.16385
Problem Signature 02: 6.1.7600.16385
Problem Signature 03: unknown

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Sometimes instead of a 'Windows has failed to start' error message, I receive an improper shutdown notice and am given options to start in Safe Mode (or Safe Mode with Networking). My system is always able to start and run fine in Safe Mode.I have been struggling with this issue for a few months and have since replaced my processor and motherboard, and sent my video card in for repairs. Whether or not Asus actually did anything to my GPU remains unknown.