New Motherboard Black Screen

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memarciniak

Oct 18, 2018
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Before I state what's wrong, and someone says it, I already went through the checklist found here http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

I have the HP Envy 700-74 https://support.hp.com/us-en/document/c03787848 with Windows 10 Anniversary Edition. My OS doesn't matter because I cannot get the BIOS screen. I replaced the mobo with a new identical MS-7826 KAILI Ver 1.0, and easy swap. I took a surge and needed a new power supply and mobo. I replaced with identically parts, not aftermarket parts. I did not get a new CPU because it appears to be fine and the beep code on failure was to replace the board, not the chip.

Is there something I can do get the BIOS screen up. I have tried the windows button + B on startup but I am using a wireless keyboard that may be not registering. Also, the possibility the chip may me be bad is stuck in my head too. (Should I send this board back and buy a new unit?)

Any advice before I lose my wig on this unit?



 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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Don't lose your wig, it won't help, and you'll still be in the same situation. Cool heads usually prevail.

Was the board and PSU new parts or used parts?

Are there any lights, or any activity at all that you can see? Fans running?

Does this system have a discreet graphics card, and if so, are you certain you have connected your monitor cable to the graphics card output rather than the motherboard video output?

 
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M

memarciniak

Oct 18, 2018
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I didn't mean to vote down the answer. It appeared to be scrolling option on my phone, sorry.

Yes, parts are new. No Graphics is onboard CPU. That's why I believe CPU may have taken the surge too. I have an identical unit and checked all the components, they work. What I have not checked was, a CPU swap to see if the CPU is bad because CPU and socket is delicate. I don't want to pull the Chip if I don't have to from a working unit to place into this new unit. I am considering buying a new CPU. The CPU being bad makes sense at this point.

The fans do spin BUT I cannot power it off once ifs on. It only goes to standby mode. I have to pull the power cord to power it down. That has to be the CPU bad?

Also, I also tried a Gforce graphics card and got nothing just for kicks and got nothing. It's plug and play. Plugged right in and did nothing, same thing.

What do you think, CPU or not? That CPU is nearly $300.00 new. I might as well get an upgrade to an I-7 4750 if I am going to spend that.

Smh?

 
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Darkbreeze

Darkbreeze

Retired Mod
Jun 24, 2014
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No worries on that. Most of us couldn't care less about the votes up and down anyhow, so don't sweat it.

I would try the CPU in the other machine. There is really no other way to know. In fact, I wouldn't be terribly surprised if you found out the original motherboard was ok, but then again, it could go both ways. Power surges of the type that can cause damage, tend to REALLY cause damage.

Did your house get struck by lightning or something? It would be a very good idea to install an earthing device at the breaker panel. Copper rod attached to the panel and attached to an 8ft earthing spike driven completely into the ground except the part that attaches to the ground rod.

Also, a whole house breaker, if your panel doesn't already have one. A few simple protections like this, plus the labor to do it, can go a long way towards making sure this doesn't happen. Any surge than can damage your PC can also take out your TV, refrigerator and other home electronics. Not worth the risk. Of course, if you get a strike directly, there's not much that's going to help really.

 
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M

memarciniak

Oct 18, 2018
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We have a surge protector at the meter, but its junk. It only protects the big stuff, not microelectronics. We lost the direct boxes too. Seems to be a mess. No direct strike.

The old motherboard is fried. It's wouldn't even power up at all. I tested the board and PSU. Both were bad. I replaced the pay, and the old still wouldn't power up. I replaced the board, the new board powered right up. I'm willing to bet it's the CPU too. There is a faint line that appears lighter in gold color from a few of the processor pin connections in the channel on one part that normally would be on a chip. I believe that is indicative the chip is bad too.

I ordered a chip to see what happens. I mean, what else could it be if my graphics are onboard in the chip too? It has to be the chip. Everything is installed right. If I cannot get a screen to see the error on the BIOS screen, my onboard graphics is fried too in the chip. Plus the power is acting funny, not wanting to power off unless pull the plug. Powers on, then power button just puts it in standby mode. I have to pull the plug to power it down. That also tells me commands are not processing thru board on a simple power down. It has to be the processor. I am going to try that. I already ordered a new CPU chip.
 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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I've never seen a faulty CPU cause a system to not be able to shut down, but when it comes to CPUs I guess anything is possible. Generally speaking though, regardless of what the CPU, memory or any add in cards are doing, the motherboard usually has full control through the switching circuit as to what can happen in regard to power delivery or shutting down.

Is the motherboard connected to the case front panel switches? Maybe those are fried? Have you tried powering the motherboard on and off with all the front panel case connections disconnected, and just jumping the appropriate pins on the motherboard?
 
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M

memarciniak

Oct 18, 2018
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Power switch runs through the mobo, but the process and command to either clear CMOS, go into standby mode, sleep mode, or come out sleep or standby mode, power down, etc all run thru the CPU. I mean, the board simply connects it all, but the processing commands all goes thru the chip in my board, including the power down mode.

Yes, I did the plug check. The new CPU is on the way. It just arrived at the FedEx facility, but it's the weekend. Hopefully, it'll be loaded out and start moving along the highway tonight to get here toward the beginning of the week instead of the end.

I even pulled all the ram out and tried just one stick, and tried a new battery too. There was only one jumper that was out of place on the board but I corrected that before startup to match my old board and the twin unit both with factory jumper settings.

Usually, this problem is tied to some kind graphics card or chip inserted incorrectly issue or something minor. The only I can think of after all the checks, unless I am missing something, is the CPU chip being bad because all those problems on my unit go thru the CPU. The Graphics are on board in the Chip. I tried using a Graphics card but got the same thing (indicative of similarity to CPU being inserted incorrectly, etc.) Spinning fans, standby power down but doesn't power off (indicative of CPU or mobo bad or PSU bad). Mobo and PSU is new, so that leaves that last domino, is the CPU bad too? I am thinking it is, unless there's something missing, and I followed the checklist and then some, followed your suggestions, still am. I also took the matching unit side by side to check it all off. It all looks right. Everything is in place, a match, perfect cloan, but black screen and spinning fans????? Ugh...

Hurricane Michael, smh!
 
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M

memarciniak

Oct 18, 2018
6
0
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I installed a New CPU, identical to the manufacturer install. It came with a smaller heat sink, but I used the HP heat sink because it was taller, and better.

I installed the NEW CPU, heat sink, and the NEW motherboard booted right up.

I assumed, since the CPU chip has on board graphics, the CPU may have been bad.

Thanks for your help.

Issue resolved, Bad CPU that has onboard Graphics in the CPU chip. Resolution, replace CPU.
 
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