HELP! Image resize is not working

Hi to all the gurus out there!

I use Photoshop CS2 and came across some kind of weird glitch. I created a new 300 dpi image and then wanted to paste a 72 dpi image into it. As we all know once you paste it in the image should become almost miniature. But in my Photoshop right now it's not changing at all. It's staying the exact same size. I've turned off resampling in the preferences I've double checked all the other setting but it's simply not displaying properly. Can anyone help? Has anyone come across this?

Any advice would be appreciated. Many thanks in advance!

Maybe the 72dpi image has larger dimensions than the 300dpi image?

Yeah, forget DPI when you're still working with it on screen.

Just look at the total pixel resolution.

300x300 pixels @ 300DPI (1"x1" when printed) is identical on-screen to 300x300 pixels @ 72DPI (4.17"x4.17" when printed).

On-screen they take up the same room. So when you're working with images like this, sure, design your ultimate canvas size for whatever you want to print, but when copying images/layers from one file to another, you have to look at the actual dimensions, not the DPI. That doesn't mean a thing on-screen.