External harddrive doesnt want to start up anymore

[qanda]This question is published in the hardware section for the Western digital My Book Home Edition WDH1CS10000 - hard drive - 1 TB - FireWire / Hi-Speed USB / eSATA-300. Click here to view full specs.[/qanda]when i plugged in the power supply i saw a flash of light coming from the front like it usually does but now it wont start up anymore. When i plug in the power it doesn’t do anything.

Hi and Welcome!

this sounds like a bad unit. It’s either the PSU, the enclosure or the internal HDD which is installed.

To narrow down this issue further, you’d need to dismantle the unit in order to test the HDD internally. But this would void your warranty.