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Despite testing using the PERFORM THESE STEPS BEFORE POSTING ABOUT POST/BOOT probs, pc still wont post/boot/beep.

Last response: in Motherboards
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June 27, 2013 10:03:27 PM

Hi guys. i'm new here so i just wanna say THANK YOU for existing. What a site! :D 
Next, my sincerest apologies if someone has already posted this problem and received a solution. i've been scouring this site and testing all solutions for hours and i'm at a dead end (but due to my tenacious personality am NOT ready to give up just yet!)
Ok, here's the scenario.....

My friend has an old desktop (build date circa 2005) with an ASUS P4S800-MX motherboard with an INTEL psu (though i can't tell you which coz the pc won't boot up). It was running XP and all was apparently fine (this all happened a year ago before i met her) but it had become slow whilst loading pages on the internet. Instead of defragging, clearing temporary files, cookies, history etc, checking with the ISP and doing ping tests, her neighbour decided that all it needed was more ram, a new graphics card and what the hell, lets chuck a second HDD in there while we're at it!
Outcome: a computer that started but was completely unstable. Would totally freeze just doing simple tasks where they had to shut it down via Task Manager. That eventually failed to work so they had no choice but to shut it via the front power button. More and more separate problems arose so the neighbour spent more time 'fixing' it than they could ever using it. Connecting to the internet became virtually impossible. Towards the end of its life, the keyboard apparently failed to work. Frustrated they shut it down via the front power button again and that's the end. It never fired up again.

My resurrection attempts to date:

(Please note that all external equipment used or exchanged in for testing purposes ie. monitors and their cables, keyboard, graphics card, IDE connectors, ram, system speaker, PSU and main power cable are all from my own desktop (an Xaser V Thermaltake gaming tower and mobo. Same circa era, same O/S and ALL have tested and retested during my resurrection attempts and ALL are working perfectly).

ALSO, ALL jumpers, pins and connections have been checked, removed and re-installed using the ASUS User Manual (that i gained online) whilst observing guidance from threads on this site.

Remove the new ram and graphics card. NOTHING. No system beep. No monitor. No mobo LED.

Restore power to mobo (cant remember how. it was a jumper or pin somewhere). LED is lit. PSU is working. Cpu fan works. SiS 661FX Northbridge thing below it warms up. HHD (i've disabled the 2nd non-original HDD) heads are spinning soundlessly. CD drive opens and closes. STILL NO SYSTEM BEEP AND NO MONITOR.

Check for system speaker and exchange for one known to work, connecting and flipping the connection as i go (always powering off and disconnecting the power cord before EVERY change). NO CHANGE.

Remove, recover and reinstall now functioning original HDD (couldn't swap in my own HDD as it only has SATA connections and the ASUS mobo doesn't have this function). NO CHANGE.

Disconnect everything from mobo except psu and cpu fan. NO BEEPS AND NO CHANGE.

Exchange psu for one of the same voltage and known to be working perfectly. NO CHANGE.

Reset CMOS by removing battery, waiting and then re-installing. NO CHANGE.

Reset BIOS (as per directions the mobo's user guide). NO CHANGE.

Reset switch disabled. HDD Led is observed not to be funtioning on front panel despite HDD sounding and feeling fine.HDD Led connectors checked, reversed and reversed again to original setting.NO CHANGE AND STILL NO SYSTEM BEEPS.

Rams removed, switched, swapped. Using original 512 ram only (this ram has NOT been tested on my own tower yet as i've ripped all the guts out of trying to get this mobo to run), i've swapped DIMM connections. NO CHANGE. (original ram is NOT listed in the user guide's Recommended and Tested brands listing but it used to run just fine with it before so i'm assuming all is still ok with it).

Replaced ram with my own of same type (DDR400) and memory. NO CHANGE. Replaced with same type but 1gb of memory. NO CHANGE.

Well i think that's all it though its highly possible that after working nonstop for over 9 hours that i could've omitted a few other tests.

So, if anyone is still here reading this essay, does anyone have any more ideas???
a b V Motherboard
June 29, 2013 5:35:19 AM

Well I would guess that after the upgrades that if they did not ground them selves properly they shorted the mobo with static and fried it. look for bulging or blown capacitors on the board that would be a good indication.
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June 29, 2013 6:16:34 AM

I would suspect that the mainboard failed. Strip the mainboard of anything extra. No, HDDs, optical drives, sound cards, video cards, or any other add-in card. Remove all but 1 stick of memory in the 1st slot (if no response try last slot). Test for the system performing a POST, mainboard beeps, keyboard lights flash, etc... If successful, add a KNOWN GOOD video card, and see if you can see the system performing the POST, and see if you can get into the BIOS. If unsuccessful, and you have a spare CPU of same type, do a CPU swap, but it's most likely the mainboard has failed. Just like te100 said, if you can see any capacitors on the mainboard either "crowning" (bulging) or have gone as far as to split open, the mainboard is done. Not that the mainboard is OK if you don't see them, it's you know 100% that it is bad if you do.
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June 29, 2013 8:09:58 AM

te100 said:
Well I would guess that after the upgrades that if they did not ground them selves properly they shorted the mobo with static and fried it. look for bulging or blown capacitors on the board that would be a good indication.


I take it the capacitors are all the tall cylindrical things? If so, they are in perfect condition albeit a tad dusty. The cpu appears to be functioning to some degree as it is transferring heat to the heatsink below it. Since i got the mobo LED to work, ive noticed that there is a high pitched 'electrical' sound when i turn the power on to the box. Is this important? As i said before, everything appears to running (cd rom, HDD) and all the connections on the back panel are receiving power. Ive removed the cpu fan and heatsink. The thermal paste was dried up. Looking at the cpu (ive never seen one before), it 'looks' ok and is devoid of any smell. Would it smell if it had been fried? Also, would the back panel connections and hardware components still operate?

Cheers :-)

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June 29, 2013 8:37:17 AM

Thank you so much for your reply. You may have noticed in my original post that ive already tried everything that yu've suggested except for the cpu swap. This cpu is an intel but the one in my functioning tower is an AMD so i dont think its compatible? The odd thing is that everything bar the system speaker and the HDD Led appear to be working (including all the rear panel connections) except of course that it wont post. Also (please bear with my niavity as this is the first time ive ever disected a pc before), ive noticed that by sitting (unscrewed) the HDD in its slot, it spins fine. If i push it forward towards the front panel and it contacts, the HDD stops. Bring it back and it starts again. Ive wiggled the connections in both positions and it truly seems to have something to do with touching the front metal panel. This doesnt make sense as the framework which supports the HDD is of the same material. For the record, i dont receive any zaps when i touch the case and the high pitched electrical sound i could hear yesterday wasnt present when i tested all the rear panel connections today.
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a b V Motherboard
June 29, 2013 11:14:31 AM

tenaciousgirl said:
te100 said:
Well I would guess that after the upgrades that if they did not ground them selves properly they shorted the mobo with static and fried it. look for bulging or blown capacitors on the board that would be a good indication.


I take it the capacitors are all the tall cylindrical things? If so, they are in perfect condition albeit a tad dusty. The cpu appears to be functioning to some degree as it is transferring heat to the heatsink below it. Since i got the mobo LED to work, ive noticed that there is a high pitched 'electrical' sound when i turn the power on to the box. Is this important? As i said before, everything appears to running (cd rom, HDD) and all the connections on the back panel are receiving power. Ive removed the cpu fan and heatsink. The thermal paste was dried up. Looking at the cpu (ive never seen one before), it 'looks' ok and is devoid of any smell. Would it smell if it had been fried? Also, would the back panel connections and hardware components still operate?

Cheers :-)



It would not smell necessarily. Like I said the mobo is very sensitive to static discharge that is why you ground yourself before you even open it. sometimes they die hard and sometimes they slowly go away.
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June 30, 2013 7:34:40 AM

Bugger :-( Thank you for help and advice though. Cheers ;-)
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September 1, 2013 1:07:49 PM

Hiya tenacious, I am sorry to hear of your predicament. I am a electronics servicing engineer and have a similar problem to you. I have recently managed to "partly" fix a motherboard. It was dead and I managed to change the components. However I now have a motherboard that exhibits the same symptoms as yours. I suspect that either the BIOS ic has blown or one of the ics. If I had a hot air blower I could replace one and then be able to tell you which IC needs changing.

Unfortunately I have yet to find a forum that actually services motherboards. I fixed another one, faulty power regulators. I have saved myself £40 on a new motherboard as the components are really cheap.

In your case your power regulators are working fine, but I suspect a chip has been fried. I will continue to work on my motherboard. If I fix it then I can point you in the right direction. For me the board has "sentimental" value for want of a better word! :-)
I don't believe in just chucking something away without at least *trying* to fix it especially when the components are not expensive.
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