Hi, my mom has a Dell Dimension 4550 that has been running fairly smooth for several years. Recently she tried to install some new DDR ram in to the mobo, and VERY incorrectly seated it. She asked me to look at it (after the fact) cause her computer would power up, but not load bios. Turns out she had the ram in upside down, so naturally because of the notch it didn't go in right at all. I seated the ram properly and tried to turn it on, same thing. I even removed the new piece of ram, leaving the original 512, and it still won't boot. Any tests I can run to see if the mobo is fried? any suggestions I would appreciate. Thanks!
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I think you have accidentally touched or moved the old stick. Pull it out and put it back. Maybe it was not properly seated in the slot.
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Meanwhile, look for the diagnostic lights found at the back of the cpu case. Observe them.
Then, pull the video card and a memory stick out of the motherboard and seat them again in their slots. Leave the cmos battery out for an hour then put it back again. …
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