Enter the set up (BIOS) menu by tapping the F2 key. Hold down the <Alt> key and depress the <E> then the <F> keys in succession. This will force the motherboard to load default settings and also force the motherboard to redetect all IDE devices. Note: The selection for the floppy drive will be set to ON. If you do not have one then you must disable floppy in set up (BIOS) menu.
SOURCE: Dimension 3100 Won't Boot
Try remove the hard dirve and then fix it back. and if the system prompted you to strike F2 then go . In the bios setup. load the " setup bios default and press "F10" to save and exit. the computer will restart.
SOURCE: No boot device available
Make sure all the connections to the Hard Drive are tight and secure. Then see if it will boot. If not then try loading a windows cd and see if it detects the Hard drive. If it does not the hard drive is no good if it does try running the automated system recovery you may have a corrupt MBR file.
SOURCE: selected boot device is not available
I had the same issue with my dell dimension 2400. The issue I was having resulted in the connection to the drive was loose. Try taking off the side of the case, find the drives in question and reseating the plugins. My pc was quite a bit older though and i don't know if this will be your solution, but its worth a shot. You can even try installing a different cable and swapping to another power supply plug.
SOURCE: no boot device available- strike F1 to retry boot ...
you can try this steps to resolve your issue:
1. clean your disc drive with white cloth and alcohol
2. try to re-install the OS
3. if this won't work try to download another boot disk like EBCD
or ask a friend to create you a boot disc and try to boot your computer with it.
- This can rule out or confirm a Bad Windows OS disc, thus let's you install you Windows OS in the process.
4. try to re-install again the OS
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