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XPS 8700 mobo/cpu upgrade


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14 replies to this topic

#1 Benny1974

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Posted 18 August 2017 - 02:29 PM

So I'm not a builder- a power surge fried the mobo and i7 4790 cpu on XPS 8700 that is only 2 years old (has Windows 10). Looking at prices, I ended up upgrading to a gigabyte H270M-DS3H, 2x4 GB DDR4 RAM, and a new i7 7790 cpu. I did the install, and was advised Dell's proprietary front panel connector would work. So, yesterday the power button worked, fans and lights came on, and the HD seemed to be spinning, but it didn't seem to boot or post. There was no video signal, whether I plugged hdmi into the mobo or tried using the old GTX 720 video card. However, it now has stopped working- power button does nothing. Depressing the button in back does get lights and fans to come on. I tried shorting the power pins, but got no response.
So, is it possible something was damaged from trying to turn it on like this? Any ideas why it would stop responding altogether? Am I better off with an original Dell motherboard and Haswell cpu in this system, in terms of getting it up and running?

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#2 Drillingmachine

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Posted 18 August 2017 - 02:40 PM

You sure motherboard and CPU was all that got fried? You did replace power supply too?

 

What is i7-7790? If you can return it, Ryzen series offer much more value for money.



#3 Benny1974

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Posted 18 August 2017 - 03:01 PM

I meant 7700 It's the new KAby Lake Intel processor. I got a good deal- just need to figure out if it can work.

I'm not positive, but a computer repair shop looked at the machine and that was what they said.

Edited by Benny1974, 18 August 2017 - 04:52 PM.


#4 Zone_86

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Posted 18 August 2017 - 06:17 PM

It may probably ok you probably just need to do a few things to get it up and running, although it sounds like could be damaged or something not working right. That said I agree with the above post you can get something like a Ryzen 1600 or 1700 that will be better in the long run over time with better multitasking and heavy workload capabilities. If you you are still within your return window I agree with above I would just return it and go with Ryzen you can get yourself into a 1600 relatively cheap with a good B350 mobo and be quite happy.



#5 Drillingmachine

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Posted 19 August 2017 - 02:17 AM

I meant 7700 It's the new KAby Lake Intel processor. I got a good deal- just need to figure out if it can work.

I'm not positive, but a computer repair shop looked at the machine and that was what they said.

 

It's still unclear what happened to PSU. Was it replaced or did you just change motherboard, CPU and memory.



#6 Benny1974

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Posted 19 August 2017 - 07:27 AM

I only replaced motherboard, cpu, and memory.

#7 Drillingmachine

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Posted 19 August 2017 - 08:52 AM

And you had power surge? Then power supply is likely damaged too.

#8 Benny1974

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Posted 19 August 2017 - 09:09 AM

Initially the diagnostic check by the computer store said it was working. Is it possible it just failed now after putting in the new board?

#9 Drillingmachine

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Posted 19 August 2017 - 10:45 AM

Sounds strange that power surge kills motherboard and CPU but not PSU. I would put new PSU even if local store says it "works".

#10 Benny1974

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Posted 19 August 2017 - 04:06 PM

Ok- so the guy at the store said to get at least a 650w psu. But running the psu calculator- even if I add in a high end gpu- it stays well under 500W load. Is there any reason an EVGA supernova 550 G3 would be insufficient? There's only a $12 price difference, but the 650 just seems to be overkill.

#11 Drillingmachine

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Posted 20 August 2017 - 03:27 AM

550W is more than enough. 650W is overkill, local store dude is quite wrong here.

#12 MDD1963

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Posted 20 August 2017 - 04:48 PM

If you are sure you will never be slapping in Vega or a GTX1080Ti, then 500 watts is plenty; however, a 650 watt PSU would allow you to run a decent GPU in the future without worrying about a 500 watt PSU's adequacy....


Asus Z270A Prime/7700K/32 GB DDR4-3200/GTX1060


#13 Benny1974

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Posted 24 August 2017 - 11:04 AM

So I replaced the PSU and Mobo, and am back to lights and fans on but it's not posting. The computer store says probably bios just needs to be flashed, and is charging me $65 to do it and make it all work. All in, I spent $536 for new cpu, ram, mobo, psu, and labor to update bios. If I had stayed with the old chipset, the Dell mobo replacement with an i5-4550 would have been $346. (Not including the original $45 diagnostic fee at the shop.) Arguably I could have kept the old psu, as the surge came through the rj45, frying the rout and modem on the way to the cpu. I would save the $65 as well using the bios and drivers already installed.
So, was it worth $200 more to upgrade to the Gigabyte H270 mobo, i7-7700 Kaby Lake, ddr4 ram and 650w psu?

#14 hamluis

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Posted 24 August 2017 - 11:55 AM

It's your money...you are the only person who can determine the value of your actions/wants.

 

Since it's a done deal...be happy :).

 

Louis



#15 mightywiz

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Posted 24 August 2017 - 02:03 PM

you installed the board yourself?  did you make sure that the motherboard stand off's are all in the correct spot and you board is not sitting on top of one that in the wrong place where there is no screw hole.

 

it happens all the time!

 

and they are easy to miss if your not doing installs on a regular basis.

 

pull the board and verify all the screw holes line up with the stand off's and there are no extra stand off's shorting to the circuit board.






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