Infinite Startup Loop: Can't Pin Down the Problem

By ThatComputerGuyGeek ·
New member here but have received good information from this site in the past. Thanks ahead of time.

Here's my dilemma:

I have an old P4P800 Deluxe Asus motherboard. Recently it started giving a BSoD and went into an infinite loop with Windows XPSP3. I figured that was my cue to upgrade to Win7 which I did. However, I'm still caught in this infinite loop where it gets to the "Starting Windows" screen, loops back and then does a launch of the repair options screen. So I began troubleshooting. I checked AND replaced the memory, HD cables, hard drive, CMOS battery, power supply, video card, CPU and finally the motherboard (an Asus P4P800 SE, essentially the same board). If you're paying attention, I built a whole new machine. The only thing that's the same is the tower. I only connected the HD and video card and it still does this loop.

I researched online and it suggested that it was an issue with the Win7 startup files and I took it through that process as well. No dice.

Here's where it gets interesting.

If I take that HD and connect it to an old eMachine (don't laugh) that I have for testing purposes, guess what? It boots right up. So, I have literally replaced every piece of hardware in that machine and it will not boot. I suspect it's something in the BIOS that may be the issue but after going through that several times, I can't ascertain what could be causing the issue. I've eliminated a software issue since it boots up fine on the eMachine. I thought I had eliminated the hardware issue as well since I built a new machine, even using some parts from the eMachine that I know work in it. So I am officially stumped. Hats off to the one that gets this one.

Thanks again.

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So does it run properly without Windows?

by HAL 9000 Moderator In reply to Infinite Startup Loop: Ca ...

I use the Ultimate Boot CD to test the hardware before I start messing around with Windows. It's nice to know that the Hardware works properly before trying to mess with Windows.

With your description assuming that you managed to load Win 7 without a issue and it rebooted the 3 or 4 times that 7 does before the install finishes you have to look for something Odd. But if it's not working at the first reboot then it sounds like a Timing Problem with the RAM. Reduce it to one RAM Module and see if it works now. Windows is very susceptible to mismatched RAM and will mess you about a lot.


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