I am sorry for the issues that you have been experiencing with your new RAM. How much RAM is found when you use our System Scanner. This scanner can be found here. If a module is missing (scanner shows empty slot), it's likely an installation issue.If the modules are half detected by the scanner, it could be a density issue. Please check the scanner and let us know and we can see what other troubleshooting we may be able to try.
I am sorry for the issues that you are experiencing with your memory modules. I pulled up your system and it appears that these memory modules are compatible with your system. At this point I would test each stick individually to see if it just one defective stick. You may even try running each stick individually in the system to see if the error occurs. Please contact us directly, using the information in my signature, if you are still experiencing issues.
Thanks for the update. We appreciate the feedback as it might help other customers on our forum. Please let us know if you have any other questions or concerns.
Thank you for contacting us today. I pulled up the specs for your system. It looks like the1mb being read in the second slot is incorrect. I am guessing that it is either a 512MB or another 1GB module. You might open the case and look at the labels on both of the memory modules to be sure.
You are able to upgrade to 8GB of memory. You have slots for memory and can put a single 2GB module in each slot. You can use any of the memory upgrades that you see listed on the right hand side. You may install two 2GB memory modules and go to 4GB. However, keep in mind that if you have a 32 bit operating system you will only utilize around 3 to 3.5GB of memory. Please let me know if you have any other questions or concerns.