Hi and thank you for your question.
Please carry out the following steps now:
Disconnect all USB devices from the computer now.
Disconnect the AC power adapter.
Press and hold the power button for at least 15 seconds.
Reconnect the AC power adapter.
Turn on the computer. Does it boot up all right this time?
Please reply at the box below, and then we will continue further.
PS: Please do NOT accept any remote assistance offer (simply "X" it out) if it shows up on this page; it's sent out automatically by our site, and not by me. We do not need to do a remote session for your issue; do update me on the results below. Thank you.
If you just bought it less than a week ago, it should still be under warranty & eligible for free tech support.
Where did you purchase it from?