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blank screen on startup

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OK, here's what happened. I purchased and installed new RAM for a friend and all appeared to go well(memory showed up) upon a restart, so I got greedy and unchecked all but the anti-virus software and cftmon from the msconfig startup option. I restarted and checked 'don't show that I used selective startup and msconfig anymore' and decided to admire my work with another restart. Only this time, windows\system32\config\system was corrupt or missing and I was to go to the recovery console. Forget about safemode with or without command prompt, or last known good configuration- same thing happened.

After getting to the recovery console via CD(not sure if it was the original), I chose my operating system(the only one on there), and then came the BSOD- page fault in nonpaged area, stop: 0x00000050. This happened repeatedly.

After doing some research, I ran memtest86. To clarify, the new memory is 512MB and the old is 256MB for a total of 768. I believe crucial.com told me that I could mix and match these sticks. Together, the memtest reported errors immediately, so I removed the old 256 stick, which worked perfectly fine before I came along, to test the obviously bad new one. Upon completing one time through the test, it showed no errors whatsoever. Mind you, I didn't let it run for 2 hours. Can memtest show false positives/negatives, or was your 2 hour runtime suggestion merely a high end estimate for those with alot of memory?

The old stick results were fine as well. I can't remember why I decided to run a 2nd memtest on the new stick, perhaps accidentally, but this time, the errors came early and often. Boy am I confused. At this point, I figured the new RAM was bad, and just went with the original 256MB stick.

I was going to do a HD diagnostic, but it told me to backup data first, so I canceled. Honestly, how could it possibly be the HD. And of course, I hadn't backed anything up yet.

Luckily, I was able to get into the recovery console after downloading rc.iso. Finally! I did a search for missing ...config\system on your site and followed the directions given to somebody else(I can get the exact page if you need it). I followed 8 steps:
ATTRIB -H C:\\boot.ini
ATTRIB -S C:\\boot.ini
ATRIB -R C:\\boot.ini
del boot.ini
BOOTCFG /Rebuild

Everything seemed to be going great except for the CHKDSK /R, which took almost 2 hours and acted funny(I left the room at 70%, but when I came back, it was only at 53%). When it completed, it said that it found an error or two and fixed them. After running FIXBOOT, I exited and I now had a "choice" for operating systems:
Microsoft Windows XP Home Edition or
Windows XP Home Edition

I realize that they are the same and they are identical in BOOT.ini, but I thought I deleted the original BOOT.ini in step 5 above? Oh well, not that I have a clue what I'm doing- no big deal. The only problem was that neither worked, but still gave the missing or corrupt ...config\system file error.

I searched for 'how to restore from the RC', and did this in the snapshot directory with my 2nd to last rp:

Now the command prompt will look like this c:\system~1\_resto~1\rp9\snapshot
Type: copy _registry_machine_system c:\windows\system32\config\system
Press enter
Then type: copy _registry_machine_software c:\windows\system32\config\software

Now I get hungup during the boot process when it gets to MUP.sys. I tried starting with the enable VGA mode, but I just get a black screen after the Windows splash screen until I shutdown. You guys do an amazing job, please help.

Thanks, Blob
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You have a topic already open on this issue HERE
Please direct all responses to that topic.
Double posting will confuse the techs that are assisting you.
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