|OK. That indicates a problem with the RAM. The first thing to do is to remove any RAM modules (assuming you can identify them) and carefully clean the contacts. Try to avoid touching any of the metal parts. A good way of cleaning them is with a pencil eraser. Then reseat the memory module(s) and see if the problem persists.|
If it does then a module is almost certainly faulty. Try taking them out one at a time (if there is only one then obviously that is the faulty one!) to see if you can identify the faulty one. If the problem stops when you take out a particular module that must be the faulty one; you can buy replacements on-line (try, for example, crucial.com).
If you are not confident with this procedure then it may be better to take it to a computer shop - the small ones tend to be better than the chain stores.
Further details here: http://h10025.www1.hp.com/ewfrf/wc/...