By and large, system files which are missing or infected with viruses can result in a Dell no boot situation. In that case, we can assist you to find the missing DLL files. If by chance, your Dell PC is not booting then we can try to use certain commands to boot in Safe Mode. At times, Windows OS may not allow you to boot in Safe Mode.
Apart from this, Dell no boot issue may occur if the disc drive or a USB drive is in use. This can happen if the bootable device order is modified. To get rid of this issue, we can suggest you to change the bootable device order from BIOS and allow the hard drive to boot along with Windows OS.