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HP a6500f will not fully turn on and beeps


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#1 odius1983

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Posted 13 July 2010 - 05:48 AM

I have an HP a6500f thats about two years old. It was running and I was turning it off using the powerbutton because it had lost display with our LCD TV and thats the only way I've gotten it to re-register with the tv in the past. When I turned it back on it started beeping from within the tower for about 15 seconds with a pause in between the beeps. The mother board is a FoxConn MCP73M02H1. I pulled out the Ram sticks and the beep changed its tone to a quicker beep. I've also reset all the connecteros and inspected everything with nothing noticably wrong. I pulled the bios chip out and it quits the beep without it. I've also pulled the little 4 prong connector coming from the powersupply and the beeping stops then as well, but it also kills all power. I slaved in a power supply from another computer and its still continued to beep. The fans and everything are running. Thanks for anyhelp.

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#2 hamluis

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Posted 13 July 2010 - 02:44 PM

Did you look up the beep codes for that system...to see what the message might be?

http://h10025.www1.hp.com/ewfrf/wc/documen...product=3740339

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#3 MrBruce1959

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Posted 13 July 2010 - 04:21 PM

A computer will usually beep if there is no video processor installed or the keyboard is not present.

Pulling the CMOS chip out without taking proper precautions first is not a good idea, the chip can be damaged by Electronic Static Discharge.

Also even if power is off to the computer, there is a CMOS battery which powers a portion of the CMOS chip to save settings such as current time and date.

I am not saying you damaged the CMOS chip, but there is still that possibility.

Please post the beeps and the sequence you hear.

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#4 odius1983

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Posted 13 July 2010 - 10:59 PM

I can't find what beep code it would match. The beep last for about 15 seconds, pauses, then continues. This goes on continuosly.

#5 Just Micro

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Posted 03 August 2010 - 11:38 AM

I have one in our shop doing the same thing and I suspect this is being caused by the Nvidia 7100 video chip. This is another series of defective Nvidia chips that will cause all sorts of stupid things to happen. The fix, I believe, is to "reflow" the chip which isn't easy nor fun to do.

We may give it a try but it's generally too much trouble since a new board can be less than 80 bucks.

#6 MrBruce1959

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Posted 03 August 2010 - 12:27 PM

Hello and welcome to Bleepingcomputer.

I do not know which operating system you originally had installed, so I am giving you a link for Windows Vista 32 Bit first.

http://h10025.www1.hp.com/ewfrf/wc/softwar...t=3740339#N1286

This is Windows 7 32 Bit. http://h10025.www1.hp.com/ewfrf/wc/softwar...product=3740339

Please note you can change the OS yourself in the drop down menu provided on this page.

I suggest you try updating and flashing your BIOS chip using a DOS version of the flash utility.

This procedure has to be followed right to the rule, or you could render your computer un-bootable!!!

The procedure also involves entering the freshly flashed BIOS EEPROM set up to load fail safe defaults, failure to do this could prevent the computer from booting again.

Sometimes you have to use the CLR-CMOS jumpers which are found on the motherboard, the CMOS battery would have to be removed from its holder to prevent a possible shorting out of the battery.

If you truly wish to perform this BIOS chip EEPROM flash and need additional advice, please let us know, that information can be provided for you.

Bruce.
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