Suggest you start off with finding out if any ram module/s have been bumped loose inside the computer.
(Ram Module = Ram 'Stick')
Doesn't take much to bump these babies loose.
The ram module, or modules may look to be seated upon a cursory inspection, but the preferred method is to remove the ram module/s, and re-seat them.
This way you are assured they/it are down in the ram slot securely, and making a good connection.
Computer off, and unplugged from power, open the computer case. BEFORE you reach inside firmly touch the metal frame of the computer case. (Not shouting)
Your body carries Static electricity, and Static will fry out (Short Circuit) computer hardware components.
Touching the metal frame of the open computer case, (unplugged from power) will relieve your body of Static.
After you remove the ram module/s it would also be best at this time to clean the contact pins on the bottom of the ram module/s.
[Gold plated contact pins,
http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpgThe above photo, is to illustrate the gold plated contact pins on a typical ram memory module.
The ram module shown is a DDR Sdram ram module.
It has 184 contact pins. 92 on each side.
The ram memory modules used in your Dell are DDR2 Sdram. 240 contact pins. 120 on each side]
To remove the ram module/s:
I don't know if you've been inside a computer before. If you have please disregard the following.
When you open your computer you're going to see a small mass of wires, and the ram module/s will be a little difficult to get to.
I find it best to remove all cables to the computer, open the computer case, and lay the computer down on it's side, on a towel, on top of a table.
Much easier to access that ram memory.
This is Dell Support, and the main menu for the Service Manual, for your Dell Dimension 5150,
http://support.dell.com/support/edocs/systems/dim5150/en/sm/index.htmIf you click on the sub-heading - Removing and Installing Parts, you'll find information on how to remove,and install your ram memory module/s.
On this page click on - Memory, at the top left.
If this doesn't work, or you need more information about the above, let me know in a Comment.
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