The power supply was checked separately and works fine.
All HP iq77x all-in-one PCs suffer from the same problem of a faulty motherboard. This is primarily a soldering issue on the graphics chip,which develops cracks in the solder balls. The PCs contained a separate graphics card, which goes faulty first. This can be removed and the display connector can be moved on the motherboard to use the on-board graphics. This will eventually show the same issue. A short term fix was to heat the graphics chip with a hot air gun or other means (plenty of suggestions can be found on-line) which sometimes works for a few weeks at most. The only 'permanent' fix is to have the chip professionally removed and re-soldered; an expensive option.
If you are lucky, your PC is still wired to use the add-on graphics card, in which case you might be able to remove this and rewire for the motherboard graphics.
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SOURCE: PC won't Boot Up
Here is what is says in the owners manual in what to do in this case, Hope this is a Help, Happy Holidays
Red Power LED
flashes five times,
once every second,
followed by a two
second pause.
5 Pre-video memory
error.
1. Reseat DIMMs. Power on the
system.
2. Replace DIMMs one at a time to
isolate the faulty module.
3. Replace third-party memory with
HP memory.
4. Replace the system board.
Red Power LED
flashes six times,
once every second,
followed by a two
second pause.
6 Pre-video graphics
error.
For systems with a graphics card:
1. Reseat the graphics card. Power on
If you need anymore let me know and I will post them for you.
SOURCE: atx12v1 cable
The repeating single beep with a small pause (actually 3 Beeps a Pause) clearly indicates problems with RAM .Replace it ,your problem will be solved . As for connecting the 12 volt 4 pin connector all mobos are designed to sense the presence of this 12 volts and ONLY THEN TURN ON.
SOURCE: hp xw6200, 6 beeps, and red power button...failed start up.
6 long beeps indicates that there is a problem with the memory, take them out, clean the contacts and the DIMM slots and reseat them.
Hopefully this will resolve the problem, if not new memory may be required
kind regards
SOURCE: HP dx5150 Microtower PC won't start up just beeps
That's what's called a POST beep code. The HP DX5150 beep code info can be found at http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=120&prodSeriesId=447468&prodTypeId=12454&objectID=c00868914,
but for your benefit: 5 beeps means you have a memory problem. Take out the DIMMS (memory sticks) and reseat them. Try to boot. If you get the POST code again, you have bad memory (unlikely, but could also be a bad FSB on the motherboard). If you have more than one memory stick, remove one, try to boot, if you get the error, put it to the other memory slot, try to boot...then do the same procedure with the other stick. If you can get it to boot on one stick, you know the other is bad.
SOURCE: 1 short beep and 1 long beep when power button is pressed.
These sounds are known as BIOS beep codes. They indicate an error with your system. Traditionally, 1 long and 1 short indicates a system board problem.
If you google bios beep codes, you will be able to find the codes that relate to your Bios, or motherboard.
Backup your files. Your computer is trying to tell you something.
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