First of all, this indicates that there is Hardware failure with your Notebook.
Try these simple steps :
1. Disconnect the AC Adapter.
2. Remove the Battery.
Note : Please see that there are no external devices or cables connected to the Notebook.
3. Hold the Power button down for 30 seconds to 1 minute.
4. Reconnect the AC adapter and do NOT connect the battery now.
5. Turn on the Notebook power.
Unfortunately, if the issue is unsloved, you can get the Notebook repaired by HP if it is purchased in US and even if it is out of warranty since this issue is covered only for few issues like Startup, Wireless etc and should be installed with AMD Processors
The detailed description of the issue is addressed in the link below :
Find the Product Number
of the Notebook which should be printed on a sticker pasted at the bottom of the Notebook indicated by P/n
and try finding them from the link below :
If the product Number of your Notebook is listed, you need to contact HP Chat Support
and provide the Notebook details like the Serial Number, Product Number and request for the free service offered by HP for the Notebooks purchased in US and which are listed in the link provided above.
Your Notebook should be returned within 7 to 9 Business days
once it is sent for repairs.
Hope this helps...