What is the fuse in the power plug?
I realise now you are in the USA. I am in the UK
Power plugs in otherwords the one that plugs intio the wall socket - the Main supply have a fuse in the UK.
I think I am right in saying they do not in the USA
Therefore it is not that
One would suspect the power supply but it may be a dead motherboard OR the power button on the tower
Unfortunately these sort of faults are difficult to investigate in an online forum.
If you feel competant I would open the case and see if there is any indication of anything occurring when you press the power button on the tower
CAUTION be extremely careful of course investigating the possible causes.
Post the exact model details of the HP please.This may helpan article by Digerati one of our staff members
I am not in favor of using multimeters on PSUs. See my canned text below on testing them. Sadly, there is often collateral damage when a PSU fails, and/or if the power anomaly is excessive. Let's hope it is only the PSU.
test a power supply unit (PSU), it must be tested under various realistic
"loads" then analyzed for excessive ripple
and other anomalies. This is done by a qualified technician using an oscilloscope or power analyzer - sophisticated (and expensive) electronic test equipment requiring special training to operate, and a basic knowledge of electronics theory to understand the results. Therefore, conclusively
testing a power supply is done in properly equipped electronic repair facilities.
Fortunately, there are other options that are almost as good. I keep a FrozenCPU Ultimate PSU Tester
in my tool bag when I am "in the field" and don't have a good spare power supply to swap in. While not a certain test, they are better than nothing. The advantage of this model is that it has an LCD readout of the voltage. With an actual voltage readout, you have a better chance of detecting a "failing" PSU, or one barely within specified ATX Form Factor Standard
tolerances. Lesser models use LEDs to indicate the voltage is just within some "range". These are less informative, considerably cheaper, but still useful for detecting PSUs that have already "failed". Newegg
has several testers to choose from. All these testers contain a "dummy load" to fool the PSU into thinking it is connected to a motherboard, and therefore allows the PSU to power on, if able, without being attached to a motherboard - great for testing fans, but again, it is not a true load or suitable for conclusive testing.
Swapping in a known good supply is a tried and trued method of troubleshooting, used for years even by pros. If you have access to a suitably sized, spare power supply, carefully remove the suspect supply and replace it with a known good one and see if the problem goes away.
I do not recommend using a multimeter to test power supplies. To do it properly, that is, under a realistic load, the voltages on all the pins must be measured while the PSU is attached to the motherboard and the computer powered on. This requires poking (with some considerable force) two hard and sharp, highly conductive meter probes into the main power connector, deep in the heart of the computer. One tiny slip can destroy the motherboard, and everything plugged into it. It is not worth the risk considering most multimeters, like plug-in testers, do not measure, or reveal any unwanted and potentially disruptive AC components to the DC voltages.
Note the required voltage tolerance ranges:
And remember, anything that plugs into the wall can kill
. Do not open the power supply's case unless you are a qualified
electronics technician. There are NO user serviceable parts inside a power supply.
This tells you how to test without the power switch on the towerhttp://pcsupport.abo...-multimeter.htmCAUTION - this is risky BE CAREFULMy advice is IF YOU are not experienced enough to know what all this means DO NOT attempt it please