This is not just something you can name "Startup Screen" and drop in your System Folder. You must use ResEdit to install it. If you've never used ResEdit, now's a great time to learn. Follow all the directions below, and you can't go wrong.
First of all, this assumes you are using System 7.6. If you're using and old system it might not work. You still can't hurt your System, but it might just not recognize the new pictures and stay with the old ones. You SHOULD get 7.6, it is more stable and uses less memory than 7.5.x.
1. Make a COPY of your system file and move it out of your System Folder.
2. Drag "System Copy" onto ResEdit to open it.
3. Double-click on the file "Startup PICTs". It will open in ResEdit.
4. There is only one resource here, called PICT, with an icon of a house and a paintbrush. Double-click it to see all the PICTs.
5. Select All and copy.
6. Go into "System Copy" and find the "PICT" resource. Its icon is the same as the one in "Startup PICTs" file. Open it.
7. Hit Command-P (Paste). You will get a message asking if you want to replace resources of the same ID or create unique ID numbers. You want to replace them.
>>>>If it says "I/O" error, there's not enough memory to paste everything at once. Copy and paste them one at a time and it will work.<<<<
8. Save "System Copy" and Quit ResEdit.
9. Move your current System file out of your System Folder, move "System Copy" into your System Folder, and rename it "System".
10. You have now installed the replacement. Restart, and your new startup screen will appear.
If you decide you don't like it, just replace your old System file and restart again, and the startup screen will be returned to default.
