Hp pavilion a6300f pc is making a horn noise, when turned on, but no picture not

the computer makes a horn noise for 30sec. off and on. i have no picture, no activity except this horn. what is the problem, ? i have cleaned the inside of dust, i have unplugged and plugged the power cord.
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More about pavilion a6300f making horn noise turned picture
  1. First step is resetting BIOS to defaults. Remove motherboard battery for a min. Then we have this guide which can help narrow down the problem. http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems
  2. i did it but it didn't stop the buzzing and still has no picture hope there is another option to fix my computer problem... email me at evebette@hotmail.com if you guys have any ideas thank you very much your help is much appreciated...
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