To successfully boot Damn Small Linux RC7 from a USB on your older Dell Optima, ensure your USB is formatted to FAT32 and created using a reliable tool like Rufus. Access the boot menu during startup (commonly by pressing F12 or ESC) and select the USB drive. If it still doesn't work, consider trying different USB ports or using a CD if possible, as older systems can sometimes be finicky with USB booting.
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