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Alarm sounds and power supply shuts off

By jscott5807 ·
When trying to boot an HP machine running Windows 98, an alarm will sound from the system speaker and then the power supply turns off. Replaced power supply but still getting the same results. Any ideas?

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by shuja52 In reply to Alarm sounds and power su ...

It is quite obvious that your CPU Fan is not working or CPU is over heating please check Fan RPM

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by mjd420nova In reply to Alarm sounds and power su ...

Along with checking the CPU fan to see if it's running, a check of the heat sink compound between the heatsink and the chip itself. Depending on the age of the unit, it may have crystalized, rendering it ineffective and un able to pass the heat to the sink and removed by the fan.

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by HAL 9000 Moderator In reply to Alarm sounds and power su ...

There is also another possibility that I've seen occasionally.

If everything is working correctly the most likely problem is that the CPU Fan isn't plugged into the right socket and because there is no reading going to BIOS it shuts down the PS to save the system. Some times the closest fan header to the CPU isn't the CPU Fan Header and you need to look up where the fan should be connected or turn off the Fan Alarm in BIOS.

You could also have another hardware problem and the Beeps that the machine is making will tell you what is wrong for a list of Beep Codes look here


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by XT John In reply to Alarm sounds and power su ...

We had used HP computers in our sites, primarily corporate models (such as the Vectra series). Whenever you get a loud squealing sound when powering up, and no screen display, there will be a series of beeps following the 'alarm' squeal. The beeps will be your error code. Usually, the error was with the power supply, such as you already tried. But the alarm sound can be any major system problem, that will not permit the system to boot, even to bring up the BIOS screen. Check HP website for the error beep's meaning. I would suspect the Memory or processor next.

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