Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I recently upgraded my RAM as it was only 2 x 512MB DDR2 2.1V, 800 MHz.

I tried to change it to 2 x 2GB DDR2 1.8V, 800 MHz but the PC would not load properly. I now have one old and one new memory in place totalling 2.5GB RAM.

Why doesn't the PC work when both the 2GB sticks are put in?

share|improve this question

Have you tried putting the one stick you are currently not using in? If it does not work then, you probably have a bad stick.

You should also check what you computer should take. Download System Information For Windows here and run it:

Check what it says against your memory configuration, and check that in your BIOS' memory settings.

share|improve this answer

Does the PC POST?

If it does then there is no good reason why it would behave like this; if it doesn't then your RAM or motherboard could be faulty (hopefully the RAM)!

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.