Re: when turned on,makes long buzz, no video,rest of pc...
Do you mean beep? Beeping may occur due to RAM corruption (indicated by three long beeps). Failure of input or output devices may also cause beeping. first unplug the RAM, if the same beep continues, then the culprit is RAM. if not,then replug it and unplug the KeyBoard. do the same with the rest of the I/O devices. Also try to put ur processor in ur frens PC, and vice versa, then u'll know if ur processor or the motherboard is not working.
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Many times when a desktop is making a strange buzzing noise - it is due to a fan malfunction of some sort. Other reasons include a power supply that is faulty or possibly a bad internal speaker.
I would first check the fan(s) for the computer. Start by turning the computer off all of the way. Next, unplug the cords from the unit. You'll need to isolate just the computer tower itself. Next, you'll want to get some compressed air or a vaccuum and gently clean out the areas where the system case fan vents are. If you know how to open the case for your desktop, it wouldn't be a bad idea to make a quick visual check inside of the case for things that may be caught in the fans. Some desktops open via screws on the back plane, and some open with a pull tab/lever.
If cleaning out the dust doesn't resolve the buzzing noise - then you'll need to make sure that the noise is not part of the electronics. If you are hearing an actual electrical buzz and not a speaker or fan noise, then there is likely a larger problem with the computer. In that case - I would take the computer to a certified professional for diagnosis.
Another culprit of buzzing noise may be a CD/DVD drive with a disk stuck in it. Make sure that you have ejected the drive to ensure no disk is stuck in the drive.
Buzzing sound points to a failing circuit, possibly a short circuit. Symptomatic of capacitors on the powerboard failing, The sound you hear is possibly that of electricity sparking across a gap in a circuit but more likely to be capacitor related, suggest taking it to a TV technician
It's not your CD making the noise, thats a buzz from a motorized device or other electronic item placed too close to your speakers or audio input cable. Automatic CD cleaners are notorious for making this noise, and are often placed near the PC.
sticky key might cause the problem and make your system hang up, try to check/replace keyboard and or your mouse,running low memory is another cause of beep, are you running more than one program that time?pop ups can cause beep too,is that helps?...
I have the same problem and I found out it was the fan of the video card cause the noise. Ton of users own this computer have the same problem, click the following link and see http://h30434.www3.hp.com/psg/board/message?board.id=HardwareDPC&thread.id=976&view=by_date_ascending&page=1
The hardware problem is cause by the GeForce 9500GS video board that cannot be fixed. If your computer still under warranty, contact HP techniocal support and replace another model or another brand video board, if not,buy another video card and replace it yourself. Remember, don't use the GeForce 9500GS video board, all this video card will have noise problem after a few months.