MB failed to POST -ASUS P5G41T-M LX PLUS LGA 775 Intel G41 Micro ATX Intel Motherboar

[CNS]

i am at a loss after pretty much exhausting all my troubleshooting. My issue is after going through 2 Motherboards (same model and shown above) I cannot get my system to post. I have done the following already:
1. remove all drives / External video cards
2. Swap RAM/ (Newly purchased)
3. Hooked up external speakers to get any possible beep codes
Green light on MB and CPU Fan is spinning. When power on, no display on screen. A

Problem is that i cannot post and also cannot get any beep codes. I hooked up an external speaker, went through 2 MB's (same model ) and am getting the exact same issue. Another thing I didn't mention is that I get a blank screen when I power on the system and no power going to any of my USB devices.

My guess is the following- Possible bad CPU, but wouldn't that invoke a series of beep codes. I don't have another 775 socket CPU to test out, so aside from that, what can i do? please advise if you have any additional suggestions.

 

[trevm999]

Maybe check the voltage readings on the power supply?

 

[sorcerer]

I'll hazard a guess at a bad CPU, but I don't know how to test it other than by substitution.

 

[NYJimbo]

Did you try to get it to boot without installing it in the chassis ?

 

[CNS]

yes, same issue without the chasis.

 

[NYJimbo]

I don't think I see any mention of swapping out the PSU for a known good one ? Did you try that. If not then I would do that next. you just need to hook up mobo power, not drives and such.

 

[DanF]

I would second to try a different PSU. I'm sure you know, bad PSUs cause all sort of strange problems... from not turning on, to random shut offs, and random boot issues.

Also, if you can get yourself another CPU to try, it would be a plus.

 

[CNS]

no, i don't have a replacement CPU, and it being old will be hard to find.

The problem i am seeing is what to tell my customer. Bad CPU, MB, PSU, i need to find a definitive issue to give him a path forward.

my inventory is minimal and would hate to purchase a part just for testing.. SUX!!!

 

[NYJimbo]

no, i don't have a replacement CPU, and it being old will be hard to find.

The problem i am seeing is what to tell my customer. Bad CPU, MB, PSU, i need to find a definitive issue to give him a path forward.

my inventory is minimal and would hate to purchase a part just for testing.. SUX!!!

No excuse for a tech not having a decent 450watt PSU for swapping and testing. Just sayin....

 

[DanF]

PSUs are not that expensive anyway, and you will end up selling it in the long run. The only disadvantage is its depreciation in cost and its warranty. But that's the fun of business.

LGA775 are not that old. I've had clients wanting to keep their Pentium4s so I had to find myself Pentium 4 CPUs as well as Pentium 4 motherboards... and I still have them running around, and I doubt I will ever use them. Most probably they will end up in the bin, but again, that's business... and I can definately understand as a self employed part time student.

 

[CNS]

i agree and its not an excuse but...NYJimbo- i totally agree with ya!!

I won't bore u with my financial crisis, but building up an inventory is not cheap!

 

[DanF]

If you can't get both the CPU and the PSU both at the same time right now, I would get just the PSU.

Why? In your situation the PSU is more likely to be sold as opposed to a CPU. CPUs (considering you're still building an inventory thus still in your early stages of your business), are less likely to get damaged. PSU replacements are more frequent. Also, LGA775 CPUs are out off their way now. AND, I think it's more like a PSU problem.

So, unless you don't want to troubleshoot the problem, you MUST to get a PSU

EDIT: Can't you use your PCs PSU? That's what I used to do when I started.

 

[trevm999]

Or a voltmeter is something you should have in your tool kit. Check to see if it is giving off the right voltages. Although swapping the PSU is easier and will leave no doubt in your mind. Some places you can get a multimeter for $10.

 

[DanF]

A PSU tester would also give you the voltage outputs. They're quite cheap and mine never failed.

A multi-meter is also useful, even to simply check CMOS batteries To be honest that's for what I use it the most hehehe

 

[NYJimbo]

i agree and its not an excuse but...NYJimbo- i totally agree with ya!!

I won't bore u with my financial crisis, but building up an inventory is not cheap!

I build up inventory AND build up my tool "kit". A PSU should be part of your tool kit and seen as an investment for proper quick and efficient diagnosis. I am not saying everybody should buy every tool out there but these things are part of diag 101 for towers.

A few sticks of ALL major types of ram, decent known good PSU, decent mid range video card for pci and pci express, sound card, test keyboard and mouse, at least one of your monitors should have a hdmi and/or standard DVI connector, etc are critical for doing the diag and not leaving it up to guess work.

 

[CNS]

Well, i want to give you a heads up on what the resolution was.

I took the MB out of the CHASIS again, hooked up nothing but CPU and FAN. I get a green light on MB and CPU fan is spinning, still no post, no screen display. I get another PSU, same thing, i am deeming this a CPU issue. In regards to the USB not powering, i looked into my MB and the first boot will not power USB without a POST...


I guess i'll order a couple of CPE's just to keep in inventory for future use. I don't wanna go through this hassle again, especially when i have a customer waiting for me to fix the issue.

 

[sorcerer]

It's not often you see a failed CPU but I've seen three over two years and all with the same symptoms as you described, which is why I thought it was perhaps your problem too. But the real problem is that there isn't any proper way of testing (not that I know of anyway) other than substitution - and then I'm always thinking WHY did the CPU go faulty? Was it a motherboard or power fault that took out the processor and will take out my known good CPU if I plug it in to test?

Not ideal, but this is where I turn to Ebay. Processors are expensive; too expensive and too many different sizes/types to keep a brand new one of each in a drawer for testing purposes, so Ebay could be your friend for this. You said it is an LGA775? There's quite a few on Ebay UK this one being just £8.75, which is approximately 14USD, and I'm sure there'll be some on your local Ebay too.

OK, so you plug it in and it doesn't work - you either send it back for a refund or you eat the $14, but if it does work, great, you keep it in a safe place and use it for testing purposes because if it's worked once, chances are it'll work again next time you need to test an LGA775 board.

 

[Rob_NNCC]

Something that has not been mentioned is:

LGA775 has several different CPU types. EG: P4, entium D, Core2duo and so on. Are you sure your current motherboard with its current BIOS can support that CPU?