timez Posted October 30, 2012 Posted October 30, 2012 Hi, I am usually very good with computers - but this one has me baffled. I have a HP DC 7600 - Small Form Factor - Desktop PC (me and my friend were fixing it up for another friend) ---------- It was working fine - and although i had reports from the last owner it cut out a lot - the last time i worked on it about a week ago - for about 6 hours straight - it didnt cut out once. ---------- Today (a week later) I turn it on - it boots normally - goes into windows - and i started a check for windows updates. Than all of a sudden (after about 2 minutes) - It just switches off without warning. (This happend at the exact same time i switched a laptop on at the wall (in a totally different socket)) - I think its just a conicendece - but thought i better say in case. --------- I have a power light on the motherboard that is on (Green) - and also the ethernet port lights work fine (Green / Orange) - it just wont switch on. At first - when pressing or holding the power button - the hard drive light on the front panel would light up (Green) - until i released the switch. I then did a power drain - unplug - hold power button for at least 20 seconds - plug back in. ...Since doing that - I have no lights come on at the front when pressing or holding the power button... Oh ok - since leaving it plugged in for about 10 mins without keep trying the power switch - that hard drive light at the front now comes ON again, when pressing or holding the power button - Still won't turn the PC on though. ----------- Things I have Tried: _________________ * Making sure all power connectors inside the case are seated properlly (and all the data cables too for good messure) * Leaving the power cable out / in for a while before trying again * Reseating the RAM (I would have done the CPU - but that thing is in there very solid - no way it could have moved on its own) * Shorting out the 2 pins for the power switch on the motherboard * Reseting the CMOS * Jump start test of PSU (Green to Black wire) - with a load - The Power Supply came on fine - on it own - Soon as its connected to the PC again - same problem. -------------------- None of this worked - execpt the PSU test - but as i say - PC still will not switch on. I have NO other lights / beeps for warnings just... Ethernet Lights = on (Green / Orange) Motherboard Light = on (Green) Hard Drive Light = on (Green) - when power switch is depressed only -------------------- I really hope someone can help me with this - as im out of ideas... Sorry for such a long post - and thank you if you read it all. And thank you in advance for any help you may give. -------------------- Timez Quote
Plastic Nev Posted October 30, 2012 Posted October 30, 2012 Hi and welcome to Extreme Tech Support - Free PC Help. Daft as it may sound, it could still be a power supply fault as you only get those lights you mention and no fans. The only real way is another known to be OK power supply. If however a different power supply still has the same result, then it may be the motherboard itself. Try either another power supply, or that power supply in a different computer if possible first, and let us know the result. Nev. Quote Need help with your computer problems? Then why not join Free PC Help. Register here. If Free PC Help has helped you then please consider a donation. Click here We are all members helping other members. Please return here where you may be able to help someone else. After all, no one knows everything and you may have the answer that someone needs. -------------------------------------------------------------------- I have installed Windows, now how do I install the curtains? 😄
timez Posted November 2, 2012 Author Posted November 2, 2012 Is it possible to use a full size ATX PSU on a Small Form Factor PC? Not permantally of course (as it would not fit in the case) But just to test it? I.E. - Will the 20/24 pin motherboard connector from the full size PSU physiclly fit the motherboard header? Thank you. Timez Quote
BreatGritain Posted November 2, 2012 Posted November 2, 2012 Hi Timez, yes a normal atx PSU will work for testing Quote
timez Posted November 3, 2012 Author Posted November 3, 2012 Oh excilent - My friend will be pleased to know we can at least test it :) I will let you know the results tommorow. Thank you. Timez Quote
timez Posted November 4, 2012 Author Posted November 4, 2012 I did try the full size ATX PSU to test it, But the connector did not fit the header on the motherboard - was way too small for the full size 20 Pin connector. Gonna have to just buy a SSF PSU to test with? Timez Quote
Plastic Nev Posted November 4, 2012 Posted November 4, 2012 Hi just looked this problem up, it does seem that the SFF motherboards have a smaller connector, is it eight pin or other? I was hoping I could find an adapter for you but there doesn't look like there is one. Hope someone else can come up with other idea's. Nev. Quote Need help with your computer problems? Then why not join Free PC Help. Register here. If Free PC Help has helped you then please consider a donation. Click here We are all members helping other members. Please return here where you may be able to help someone else. After all, no one knows everything and you may have the answer that someone needs. -------------------------------------------------------------------- I have installed Windows, now how do I install the curtains? 😄
BreatGritain Posted November 5, 2012 Posted November 5, 2012 I apologise. I've broke down a few Shuttle XPC SFF computers and the PSUs from these were interchangeable with normal ATX ones, I assumed it would be the same theory. Quote
timez Posted November 6, 2012 Author Posted November 6, 2012 Thats ok - my friend says we will buy the power supply and if it still doesnt work - we will keep the PSU as a spare for future use on other PCs of that size. - When we get the new one and try it - i will let you know the results. - It may be a week or two. Timez Quote
timez Posted November 14, 2012 Author Posted November 14, 2012 Ok I saw him today and he said - rather than buying a PSU and it possibly still not work... he asked is there an adapter you can get to test it with a normal one. It looks that the 24 pin ATX to HP Mini ATX adapter does exist. ------ However... ------ as you know - most boards use a 4 pin CPU extra connector - so far so good... The HP DC-7600 does not... It has a 6 pin connector (and i very much doubt the 6 pin PCI-Express connector is going to work or even fit this. -------- Do you think there is any chance of an adapter for this existing as well somewhere? I know i could probeblly get a multi-meter and see what voltage is supposed to come out of the old PSU pins for this - and cut and splice a working standard ATX PSU 6 pin PCI-EX connector to do the same - but the plastic may not fit - i have not tried yet. ------ Its fine if i can just cut and splice the working PSU - and test with that + the adapter for the 24 pin connector. ------ I really do not want to have to cut and splice the actual HP SFF PSU - as my friend will not be happy at all with that. ------ Is that my only option though if the physical block of the standard PSU PCI-EX does not fit on the motherboards 6 pin connector? -------- I realise thats all very confusing to read - but what i basiclly mean is - If it came to it - i could cut the real 6 pin block off the HP PSU - and splice it with the known working standard PSU after testing what voltage should be coming out of that. But my friend and me wont be happy - because if it wasnt the HP PSU thats gone - we have cut it and would have to splice it back together - and if it is working would want it in tact. ------ So my main question is - does anyone know of an adapter or anything i could use instead? so it would be - ATX 4 pin CPU power to HP propority 6 pin motherboard header. ------ Thank you Timez Quote
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