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| Thread ID: 82643 | 2007-09-03 09:10:00 | PC Won't turn on | Bob_the_lob (10622) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 587450 | 2007-09-03 09:10:00 | Hi I have a similar problem to this: www.pressf1.co.nz Sorry for how hard this is to understand, I wanted to try to give all possibly-relevant details... Which is that I basically swapped the cases on two computers (a Compaq Evo d510 CMT and a Compaq d530 sff [note sff means small => strange power supply] ). All of the plugs were equivalent on both motherboards so I could easily plug everything back in, except for one plug on the d530 mobo which was an odd 2-pin cord from the psu to nearby the ide connections (with no label more descriptive than "P?", where ? is a number I've forgotten at this moment). Oh, I also kept the cpu fan with the case (ie swapped fans/heatsinks on the cpus) because the sff had a special one for the tiny case. Now the "d530" (with the d510 mobo and drives, but d530 case and psu) works fine when I plugged it all back in, but the "d510" (with d530 mobo, cpu and drives, but d510 case and psu) doesn't start up. A little green led shows on the motherboard, but when the power button is pressed, the fans spin for about half a second then nothing more happens. I have tried unplugging everything except floppy, fans, ram, and shorting the power-on pins, and using a different (and much more powerful), working cpu, but same thing happens. Please help! |
Bob_the_lob (10622) | ||
| 587451 | 2007-09-03 09:32:00 | Had the exact same problem with some Compaq's. Note SOME ! That little 2 pin power cord from the PSU, I think has something to do with the CPU power. The CPU fan started fine, but do you think it would boot.:groan: One other thing you have to watch out for, Compaq don't always follow suit with the USB connectors, and the order of wiring RWGB. Bit hard to draw it here , but normally the USB runs in 2 rows - Compaq sometimes wire them in a square RW GB |
wainuitech (129) | ||
| 587452 | 2007-09-03 09:35:00 | Compaq d530 sff [note sff means small => strange power supply] ) . the "d510" (with d530 mobo, cpu and drives, but d510 case and psu) doesn't start up . Because it has the small crap PSU . Try another PSU in it . (ANd then you may need to use a proper case so you can fit a proper PSU in it) |
pctek (84) | ||
| 587453 | 2007-09-03 10:20:00 | Could the USB stop it from powering up? I have tried starting it with the front usb connectors unplugged (when doing the "screwdriver jumper") but no change. Also the USB's work fine on the other computer. Sorry it's so confusing pctek... the one that doesn't start up has the better (bigger) psu, and I've also tried an even better one that I know works... no change. I'm sort of worried about this little 2 pin power connector. This was plugged in when the currently-dead mobo was working. I tried plugging in a similar looking connector in the new case but there was no visible change to the problem. And I don't have a multimeter handy so can't see if the voltages are the same in these similar looking plugs. Does anyone know what these are for? |
Bob_the_lob (10622) | ||
| 587454 | 2007-09-03 11:08:00 | The ones I had problems with were intel CPU's. What is the CPU on the one that wont boot. One thing that I do try myself is if a board wont boot, remove everything that is not needed , USB ( shouldn't cause a problem, but never know) Modem, addition cards. |
wainuitech (129) | ||
| 587455 | 2007-09-03 11:17:00 | Remove the mainboard from the case and test it on the work bench. If possible get the original PSU back with the 2-pin connector and try it again. |
CYaBro (73) | ||
| 587456 | 2007-09-03 21:06:00 | Bob, P16 by the IDE connect is the PSU fan control, i imagine there is a fail safe to stop the system booting if there is no connect to this pin. USB can prevent a system posting however I havent heard of it stopping a system powering up. If incorrectly wired (as some do pin them different), you may have damaged the board. Another postering suggested taking the mobo back out of the case in testing on the working bench. I would 2nd this suggestion and retest with the correct PSU and only ram, cpu and video card. |
SolMiester (139) | ||
| 587457 | 2007-09-08 13:02:00 | Thanks for your help. I finally had time to try out your suggestions today and found that it was shorting to the bottom of the case. Fixed that, now it works fine... sorta. Just noticed that the sound now doesn't work. Any ideas why? Did I kill it when repeatedly making short-circuits through a random part of the motherboard? |
Bob_the_lob (10622) | ||
| 587458 | 2007-09-08 22:44:00 | Sometimes those models of 440? have a seperate audio outlet in one of the rear PCI cover plates ( sort of thing) Just above the PCI slots- with a orange picture of a speaker. While the standard 3 x outlets are there, the sound doesn't work to good or at all. This plate is connected to a speaker outlet header on the MB. Check to make sure thats connected if it has one. |
wainuitech (129) | ||
| 587459 | 2007-09-09 06:27:00 | Thanks, Wainuitech. It has another headphone jack on the front which I had not plugged into the mobo (because the equivalent one on the other computer was causing problems), so I plugged that in and it works. :D Strange that the ones at the back (which are right on the mobo) don't work though. |
Bob_the_lob (10622) | ||
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