I've seen that result with a faulty motherboard.
But you can try some things first. Disconnect the data and power cable from every drive, remove any PCI cards and disconnect all externally connected devices like a printer and keyboard and try powering it up.
But you can try some things first. Disconnect the data and power cable from every drive, remove any PCI cards and disconnect all externally connected devices like a printer and keyboard and try powering it up.