Computer unplugged from power, computer case open, observe Anti-Static precautions, then remove the ram memory module/s.
(Slang for ram memory module, is ram memory 'stick')
Use a pencil eraser, and clean the gold plated contact pins, on the bottom of the ram memory module.
Just rub the eraser on the contact pins.
(If the eraser on the end of the pencil is attached by a metal sleeve, refrain from letting the metal sleeve touch the contact pin/s)
When handling the ram memory module, refrain from touching the contact pins on the bottom.
You can handle the ram memory module anywhere else, as the body is coated with a see-through protective plastic.
Lay the module on a wood table, or other non-Static surface when cleaning.
Example of a DDR Sdram ram memory module as used in a Pavilion 523n,http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg
Use air to remove the eraser dust.
(You can use a can of compressed air for computers, or air pressure from your mouth is sufficient)
Reinsert the ram memory module/s. Close the computer case, plug back into power. Wait 1 minute, turn the computer on.
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the hardware components inside a computer.
Working on a table, computer unplugged from power, computer case open, TOUCH the metal frame of the computer case (Unpainted surface) to relieve your body of Static.
Should you get up, and walk away in the middle of working on your computer, upon your return Touch the metal frame again ]
Opening your computer case.
Looking at the Back of the computer, there are two screws on the far right edge.
One above, one below.
Remove the two screws, slide the side panel back about 1 inch, tilt the side cover top to the outside, remove the side cover. (If memory serves)
Should you need guidance in removing, and reinstalling a ram memory module, hit me up in a Comment.
(Believe upper right of your page. Fixya is constantly under going change to improve the website)
HP Support > Pavilion 523n > Product Specifications,http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph07767&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=90387
HP Support > Pavilion 523n > Motherboard Specifications (Scroll down to see an illustration of the motherboard, and photo below it)http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph07899&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=90387