Win 7 Repair Reinstall hangs at final re-boot

Win 7 HP 64-Bit SP1
Attempting a Repair-Reinstall on 1TB Western Digital Hard-Drive.
Machine will boot as-is, but I don't want to do a full (clean) install due to the amount of data and stuff on it. The Repair-Install goes as it should (I've done them before) except at the very final re-boot (immediately after key-code entry when it says the system will now re-boot), the screen goes blank and stays blank. No blinking cursor, nothing. The system is not frozen. The Num-Lock and Scroll-Lock still toggle and hard-drive LED shows some activity. I've waited overnight and still nothing. When I finally force it to reboot, it says the installation failed and rolls back to the beginning restoring everything to the conditions when I began. Device Manager notes no flagged issues or drivers. Hard Drive is basically new and I scanned it for errors before beginning using Western Digital Data Lifeguard utility plus I ran chkdsk /r/f on the OS partition before beginning.

Any suggestions?

Layback Bear, thanks for the quick reply.

Ironically, that is the exact steps I found earlier and followed to the letter.
Everything proceeded as described up to Step 20.
Looking at the two screen captures in Step 20, mine gets to the first screen just fine, but does not continue to the second screen. My screen simply goes black with no cursor or display of any kind.

10 hours now and still counting (as I write this).
It is the weekend, so I can continue to leave it undisturbed for another 24 hours and report back.
However, I'm not too hopeful . . . . . . but then, I'm a pessimist by nature.
Either way, I will report back.

This forum is, by far, the best Windows 7 forum I've ran across.
I've been here dozens of times and I usually find the answers I'm looking for in old postings.
This is the first time I've ever needed to add one of my my own.

The computer proceeds "by the book" up to the point that it black screens, so my issue must be something rather basic that I'm simply overlooking. I didn't mention previously, but the 1TB HD is configured pretty "vanilla". By that, I mean it is basic 1-partition, 1-OS, Win 7 HP SP1, NTFS (No SSD hard-drive, No RAID, no high-performance stuff or special drivers of any sort). It's my niece's family "home computer" so it is a very,very basic box, even uses the Intel on-board video. Only USB devices plugged-in are the mouse and USB keyboard. I would think the Win-7 install disk should find all the basic drivers that it needs to do a repair-install.

Sorry, out if frustration, I probably gave too much info.
Clarifying........ your list is what is plugged in, nothing more.
I have a one SATA hard-drive, one SATA DVD drive, mouse and keyboard only.

At this point, if I shut down and force a reboot, it will generate an "installation failed" error and immediately roll back to where I started. It does not finish the repair install.

Also, to clarify, I've been through this a half-dozen trys and even tried using two different Win 7 HP install DVD's.
The results are always the same.

All are Win 7 Home Premium 64-Bit SP1.
Since it was originally a Dell, it was shipped without a Win DVD, only the restore partition (which I hate).
Therefore, I don't have a genuine Dell-labeled Microsoft Windows 7 DVD.

Even with my key-code, Microsoft will no longer let you directly download the iso from their site if you have an OEM install (such as this DELL does). Therefore, I have two copies of the proper version, both of which were obtained from different trusted sites.

One DVD was directly obtained from Digital River some time ago. Note that I obtained it before Microsoft pulled the iso's off-line @ Digital River.
My 2nd from another trusted site which I frankly can't remember. However, it crashes at the exact same spot at re-boot.
Both are capable of doing a complete fresh clean-install without any issues. However, this will wipe all existing data off the hard-drive which is what I'm trying to avoid in the first place.

Sorry to be lengthy, but here is a summary of things I've tried.
1. I've done a total drive image & restore into a new, empty (and thoroughly tested) drive so that I'm not messing with the original hard-drive drive. Before beginning with a repair-install, I verified it operates EXACTLY as the original installation did. All of the partitions can be accessed (Win OS, Dell Restore and Maintenance). However, when I do a Win 7 repair-install, it always fails at the same point at the very end.

2. I wiped the hard-drive and then restored the original drive-image back into the new drive. It occurred to me that the Dell Restore and Maintenance partitions "might" be confusing the generic Win 7 repair-install. Therefore, I tried deleting all Dell Restore & Maintenance partitions. I then ran Maintenance to restore the drive to bootable status. No problems with any of that. The computer will boot and load Windows without a hitch. Finally, I tried another repair-install over THAT installation. It again fails at the exact same point at the end.

I'm CERTAIN both of my Win-7 DVD's are good because I can easily do a full-installation from either of them. The problem is that I lose all of my installed configuration. Since I have a full image of the original
drive, I can easily wipe things, do another image restore and re-start from scratch. All I lose is the time it takes to perform every restore.

Sorry to be so lengthy, but I've tried enough stuff to write a book and been to 200 different forum sites looking for answers. PLEASE do not be offended (I sincerely appreciate ANY assistance anybody can offer) but this isn't my first rodeo . . . .I've done this a half dozen times before on different hardware and know the steps. This time, something just isn't cooperating as it usually does.