Paul Stoops
08-24-2001, 01:30 PM
Altho I am new to this forum, I am very impressed with the quality of the helpful responses from you folks.
I am building my first PC using the following components:
Enlight 7237 Case w/300W P/S
Asus A7V133
Athlon IGHz w/Coolmaster 60mm X 80mm HSF
265MB Micron Technology PC133 SDRAM
ATI All In Wonder 128 Pro (AGP)
IBM 40GB 7200 ATA 100
During assembly, I was careful to eliminate ESD problems by grounding the case and using a wrist strap.
After I assembled the components, the system refused to boot. The onboard LED was lighted when I turned on the AC power and stayed lighted when I pressed and released the front panel switch. When I released the switch, the P/S, mobo, CPU and chassis fans all came on for just an instant and then went off. No beep codes. The monitor didn't wake up.
I tried reseating the CPU, memory, video card, and all cables and shorting the BIOS. I checked all of the DIP switches and jumpers (set for jumperless mode). I checked all of the front panel switch/LED connectors.
I tried it again after removing the mobo from the case and mounting panel and setting it on a nonconductive surface w/o anything connected except the CPU w/HSF, chassis fan, and speaker (no memory or video board), looking for a beep code. No beeps, no change.
I tested the P/S w/Power On and Power Good pins jumpered and all voltages appeared to be okay. The P/S fan and chassis fan worked okay. I removed the jumper and the +5V Standby voltage was okay.
I checked the performance of all of the fans by separately applying 12V and they were all okay.
I also tried a 250W Enlight P/S from my old computer and the results were the same.
The only glitch that I have been able to detect occurred when I first powered up the system. I noticed that the onboard chipset fan did not move, altho the CPU fan moved briefly. After close inspection, I discovered that a plastic mounting stud like the kind attaching the HSF to the chipset had apparently fallen into the fan and lodged itself under the fan blades, jamming the fan. I don't know if this caused any damage or not when I powered it up initally. However, this makes me think that the mobo never saw a final powered up inspection test after the chipset fan was installed! The jammed fan would have showed up at that point.
It appears to me that the mobo is not furnishing the Power Good signal to the P/S.
So, kind folks, I'm fresh out of ideas. Any suggestions or help you can offer will be most welcome. I have ordered a replacement mobo, CPU, and SDRAM chip so I can do some swapping to try to isolate the problem. It is sure looking more and more like a bad mobo to me. But then if I had all of the answers I wouldn't have to bother you folks, would I? http://www.PCGuide.com/ubb/smile.gif
I have learned more than I wanted to know about how a PC works during this adventure! Thanks for being there to help.
Paul Stoops
I am building my first PC using the following components:
Enlight 7237 Case w/300W P/S
Asus A7V133
Athlon IGHz w/Coolmaster 60mm X 80mm HSF
265MB Micron Technology PC133 SDRAM
ATI All In Wonder 128 Pro (AGP)
IBM 40GB 7200 ATA 100
During assembly, I was careful to eliminate ESD problems by grounding the case and using a wrist strap.
After I assembled the components, the system refused to boot. The onboard LED was lighted when I turned on the AC power and stayed lighted when I pressed and released the front panel switch. When I released the switch, the P/S, mobo, CPU and chassis fans all came on for just an instant and then went off. No beep codes. The monitor didn't wake up.
I tried reseating the CPU, memory, video card, and all cables and shorting the BIOS. I checked all of the DIP switches and jumpers (set for jumperless mode). I checked all of the front panel switch/LED connectors.
I tried it again after removing the mobo from the case and mounting panel and setting it on a nonconductive surface w/o anything connected except the CPU w/HSF, chassis fan, and speaker (no memory or video board), looking for a beep code. No beeps, no change.
I tested the P/S w/Power On and Power Good pins jumpered and all voltages appeared to be okay. The P/S fan and chassis fan worked okay. I removed the jumper and the +5V Standby voltage was okay.
I checked the performance of all of the fans by separately applying 12V and they were all okay.
I also tried a 250W Enlight P/S from my old computer and the results were the same.
The only glitch that I have been able to detect occurred when I first powered up the system. I noticed that the onboard chipset fan did not move, altho the CPU fan moved briefly. After close inspection, I discovered that a plastic mounting stud like the kind attaching the HSF to the chipset had apparently fallen into the fan and lodged itself under the fan blades, jamming the fan. I don't know if this caused any damage or not when I powered it up initally. However, this makes me think that the mobo never saw a final powered up inspection test after the chipset fan was installed! The jammed fan would have showed up at that point.
It appears to me that the mobo is not furnishing the Power Good signal to the P/S.
So, kind folks, I'm fresh out of ideas. Any suggestions or help you can offer will be most welcome. I have ordered a replacement mobo, CPU, and SDRAM chip so I can do some swapping to try to isolate the problem. It is sure looking more and more like a bad mobo to me. But then if I had all of the answers I wouldn't have to bother you folks, would I? http://www.PCGuide.com/ubb/smile.gif
I have learned more than I wanted to know about how a PC works during this adventure! Thanks for being there to help.
Paul Stoops