memory problems

Could be one of many reasons ...

1) You have put more RAM in the machine than it can handle

2) You are running win9x/ME which has a problem seeing/running with more than 512 MB of RAM

3) You have put in RAM which is incompatible with your MB or if you have win XP, with your OS

4) Your RAM chip could be bad or faulty

5) Your slot with the new RAM could be bad

To fix these problems ...

1) Check with the manufacturer to see how much RAM the MB can handle

2) If you are running win 9x (95/98) or win ME, cut your RAM back to 384 MB

3) Check with the HCL for win XP about which types of RAM are compatible ... Check with the MB manufacturer about which type and speed of RAM works with your MB like ... not that SDRAM will fit in RDRAM slots, but the speed will defintely matter

4) go to www.memtest86.com and download the program to test out your new RAM chip(s)

5) place the new RAM in the slot where the old RAM is and see if the machine boots up

These are just some of the possibilities ... write back with more info if none of these solve the problem ... specs like OS, MB, RAM type, current machine config, etc

Hope this helps.

-Dave

I assume you checked the manual before you got the additional RAM.
I also assume that the BIOS POST shows the problem since you said PC, so this is not a OS problem.
Assuming you put in the proper RAM for the motherboard, several things can be wrong.
The first has to do with speed.
The slowest RAM has to be in the lowest memory bank.
(Usually marked as bank zero on most MBs.)
Swap the modules to check this if you do not know how to read the code on the chips.
This problem can also be incompatability between manufacturers.
Check this by installing the DIMMs one at a time.
Are they individually good?
EDO SIMMS have to be installed in pairs.
Make sure the SIMMs in each pair are identical.
(Make and model are the same)
NOW THE DUST PROBLEM!
Since, from your question, it appears you added RAM, did you make sure the slots were really clean?
PCs are usually loaded with dust because of the Power supply fan, and no filters.
Dust dirt can prevent the contacts on the RAM from meeting with the MB contacts.
Well this is a start. We always setup PCs with identical RAM modules for this reason. This problem is not common , but it happens.
Regards, Chris