I am currently working on an emachines e525 (its for a friend, I would never buy an emachine) and when I got the machine it was stuck in a boot loop to the startup repair. I could not boot into windows via safe mode or any other method. I ended up reinstalling Windows 7 and everything looked fine until I rebooted. The startup repair loop started again. Frustrated at this point I formated the hard drive and installed Windows XP. It was working great for a while even after I rebooted several times. I went to bed and then today turned the laptop back on and I got the unmountable_boot_volume blue screen. I think the issue is either with the hard drive or mobo. Does anyone have any ideas or suggestions?
I also have ran chkdsk multiple times and it doesnt find anything to repair. I also ran a memory test (even though I did not believe that is/was the issue and it came back with no errors.
You need to run a full disk scan, not chkdsk. Look for a disk scan option in the BIOS of the laptop, or boot off a CD that had hard drive scan tools like UBCD. Make sure the drive is seated well in the case.
Definitely sounds like a hard drive problem. As hang-the-9 suggested, download the Ultimate Boot CD and use some of the hard drive diagnostic tools it includes to check the drive. Running chkdsk will not check the disk at a deep enough level to provide any useful data on whether the drive is failing.
The UBCD did not recognize the hard drive. Well, it saw the C: drive but there was no size to it. I booted into Hirens Boot CD and it sees the drive fine. It is currently running HD Tune 2.55 error scan.