Diagnosis
You've got a classic no-power situation. The most likely culprit is a fault in the power supply circuit or a completely failed internal fuse.
How to Fix It
First, let's rule out the simple stuff. 1) Unplug the power cord from both the wall outlet and the back of the projector. 2) Wait a full 60 seconds. 3) Plug it firmly back into the projector first, then into a known-good wall outlet (try a different one, not a power strip). Listen closely for a faint internal click or hum when you plug it in. If there's absolutely no sign of life, the internal power board likely needs service.
If That Didn't Work
If you're comfortable with a multimeter, you could check the power cord for continuity, but it's rare for those to fail. The reality is, a completely dead unit with no standby light points to an internal component failure that requires a professional repair tech to open it up.
Heads Up
Don't keep unplugging and replugging it repeatedly trying to get a response. If it's a blown internal fuse from a surge, cycling power won't help and you risk causing further damage. Contact Hisense support with your serial number ready.