No POST after switching cases- onboard video

[jmgern24]

I have been reading a few threads here today and found that I am having a similar problem some others have had regarding buliding a new system. Mine is pretty much the same except for one minor detail, so hey, why not start a new thread? Anyway, I switched cases for my Dell L1000r Dimension computer the other night. The probelm I have run into is that the power supply included with the case does not work, only the Dell power supply that came with the Dimension works. (I read a reply on a thread by Cricket on the Dell power supplies to understand this). That problem is solved. Now, the other problem is, I connect only the P1 PS connector, RAM, and CPU to the motherboard, and I get no POST on the screen. The difference here is that I have no AGP video card, the video is onboard for this motherboard. Power light on the MB is on, the CPU fan spins, but no POST! I get no beep codes. I am stumped. I hope that by actually connecting the power supply that came with the new case I didn't fry anything (like the video). If I did indeed fry something, would the CPU fan work and the MB power light come on? Any comments would be appreciated. Thank you.

[DarkPacMan77]

if you fried something, chances are the cpu fan and mb power light would not come on, if at all, but if so, just for a split second... considering you do not have a graphics card in the rig right now... this problem is really stumping me.

glc, mr ferrari, cricket < those are people that will most likely provide good information

missing the 2x2 pin connector for the motherboard?... idk

[glc]

That Dell motherboard and power supply is proprietary. DO NOT CONNECT a standard power supply to that Dell motherboard, you WILL damage the power supply and/or the motherboard!

[jmgern24]

This MB is does not have to 2x2 conncetion because it is a few years old. Thanks for the input though.

[jmgern24]

Originally Posted by glc That Dell motherboard and power supply is proprietary. DO NOT CONNECT a standard power supply to that Dell motherboard, you WILL damage the power supply and/or the motherboard!

That is my worst fear! I may have done that.

[DarkPacMan77]

that is most likely yet another reason why people are always saying that Dell computers are just hooey...


yea, seems like you did that though...sorry about your luck. I figured the 2x2 power connector wouldn't be there... but, i had to suggest something lol!

[jmgern24]

[QUOTE=DarkPacMan77]that is most likely yet another reason why people are always saying that Dell computers are just hooey...
QUOTE]

I have to agree on that. My wife got this PC for free through her work tha is the only reason why we have a Dell. As I gain more experience building Pc's it becomes more evident that they can really make simple things difficult!

[jmgern24]

One more senario for everyone...maybe this will give me a hint as to if my motherboard and new power supply is dead. First, when I use a power supply tester on the power supply the green light indicating a good PS does infact come on. Can I assume the power supply is okay? Second, when the new power supply is connected to the Dell motherboard (the power does not even have to be tripped) I get this high-pitched sound, not very loud, almost what it sounds like when you turn a TV on. Has anyone had a dead MB with this symptom?

[DarkPacMan77]

dell computers are amazingly well-built from what i have seen, however like you mentioned, they do seem to make everything difficult.

[DarkPacMan77]

ask panamared, a forum admin.

i think the psu can still show that it is ok, you would need to use a voltmeter i believe.

this raises the possibility that the mobo is indeed the culprit...

this would alllllllll be solved very easily if you could find SOME computer with a pci-e slot... that way you could test the gpu.

[jmgern24]

Originally Posted by DarkPacMan77 ask panamared, a forum admin. i think the psu can still show that it is ok, you would need to use a voltmeter i believe. this raises the possibility that the mobo is indeed the culprit... this would alllllllll be solved very easily if you could find SOME computer with a pci-e slot... that way you could test the gpu.

Yeah, I agree with you...the MB seems to be the leading culprit. The GPU testing would be the sure fire way to find out BUT...

not sure what my next move is to make sure the MB is the reason for all of this. Al I can do is keep trying until I get so tired of doing it, then break down and buy another MB. The reason why this one is so near and dear to me is that it still uses SDRAM (which I have a ton of lying around) and with a new MB and processor comes DDR RAM (which I have none). Just trying to save a few $$$. Oh well, these things happen.

[Panama Red]

As glc stated early on, if you've already tried a standard ATX psu connected to a proprietary Dell mobo, chances are good that the mobo has sustained damage. This will happen when the incorrect voltage is applied to the mobo connector. Take a look at the pinout for the standard ATX psu you have and the one on the Dell psu. If the two 20 pin connectors have different color wiring configurations, the voltages are different.

[jmgern24]

Thanks Panama. Yeah, I checked that out this morning on the Dell website. It clearly shows what each pin on the P1 connector has and it is different from the new PSu that came with the case. Just something that I am not used to having to check...until now.

[Cricket]

Did you try the out-of-case-troubleshooter yet?

Cricket

[jmgern24]

Sure did Cricket, to no avail. It just gets me that the power light on the MB comes on and the CPU fan works but no display. I guess I should give it up and go get another MB.

[chuck4456]

I'm not sure how old that one is, but DELL used to send the Chipset Drivers with some of those. I had a similar problem (once) and had to reinstall the graphix driver from their CD.

[DarkPacMan77]

that seems too simple of a solution... i think the motherboard has become damaged from the alternate psu. The gpu and ram and processor may have all been affected as well... Usually, when something concerning voltages goes too wrong, just about the only part(s) that ever survive are the optical drives and the case fans... hard drives can live through a few heart attacks too.