|Note at the time I am posting this, it appears HP is doing maintenance on their site. |
You MAY get a message "Service Unavailable" when you click on links that are on the HP site in this topic - if so, try again in a while.
"What is the issue with the Motherboard and how have come to the conclusion it is faulty ?"
A defective mboard is one of the least likely things, unless it's bee damaged by an external event, such as a power surge or spike during a power failure event.
It's a lot more likely something else is wrong.
Failing power supplies are common in any case.
If you can,
- try connecting another power supply with a wattage capacity of the same size or higher
- or, better still, try the power supply with another working computer, that your power supply has enough wattage capacity for.
Other common causes...
Your mboard may have a PCI-E X16 slot and the case has a 300 watt power supply.
If you have installed a video card in that slot that the computer did not come with that requires a power supply with a min capacity of a lot more than 300 watts, your mboard may not boot at all when the card is installed.
If you ave changed which ram modules you have installed, not all ram modules that you might think should work will work with your mboard. In the worst cases or ram incompatibility, your mboard will not boot at all, and probably won't even produce an error beep pattern.
HP 500B Microtower PC - that's a series of models, not a specific model.
Possible specific model "numbers":
HP 500B Microtower PC (A7H86UT)
HP 500B Microtower PC (A7H87UT)
HP 500B Microtower PC (VS875UT)
HP 500B Microtower PC (VS876UT)
HP 500B Microtower PC (VS877UT)
HP 500B Microtower PC (VS878UT)
HP 500B Microtower PC (VS879UT)
HP 500B Microtower PC (XZ826UT)
HP 500B Microtower PC (XZ827UT)
HP 500B Microtower PC (XZ828UT)
HP 500B Microtower PC (XZ857UT)
HP 500B Microtower PC (XZ858UT)
HP 500B Microtower PC (XZ859UT)
HP 500B Microtower PC (XZ860UT)
HP 500B Microtower PC (XZ924UT)
HP 500B Microtower PC (XZ925UT)
Search here using your specific model "number", e.g. A7H86UT, to get the parts list for your model:
PC Board - the possible mboards - if there is a camera icon at the begining of the line, click on it to see a picture of it.
The mboard part number is on a stuck on label on the mboard, if it hasn't fallen off and gotten lost
- shows the possible part numbers and wattage capacity, e.g. 300 watts
Search the the web using the HP part "number" of the mboard you have.
If you get one or more "hits", make sure the info says the mboard has been TESTED before you buy it.
"....I suggest you replace it with a retail board rather than an identical HP board."
The probable possible problem with that is HP and many other brand name system builders use cases that usually have one piece connectors for the wiring of certain headers on the mboard, e,g. the front panel header. All the possible HP mboards that use the same case are compatible with those one piece connectors ad their wiring, but a retail mboard model may NOT be - if it isn't, you need to customize the connectors that connect to the wiring from the case, BUT the problem with that is the HP site almost always does NOT show which pins on the mboard headers of the original mboards are for what, in the maintenance manual (which IS available for your series) or in the detailed mboard info (which it appears is NOT available for your series)..