Can’t get new system to post

toxicrabbit

toxicrabbit

toxicrabbit

Associate
Joined
1 Dec 2018
Posts
9
Just bought a new rig from Overclockers to build myself. It’s not my first by a long shot but I can’t get this system to post. I have spoken to support three times and we decided to return the Mobo and cpu and both apparently tested fine. Got it back today and same problem, the board hangs at a6 or 78

Currently breadboarded

I have tried:

With 1 stick of ram, all 4, 2, each individual stick on its own. Single stick in different slots.

With and without the two 8 pin power connections

Tripple checked power cable connections, that the ram is seated, that the cpu is seated.

With and without the cpu fan detector

With and without the graphics card

Two different monitors

HDMI and DisplayPort cables

Checked various “my system isn’t working checklists”

I haven’t been able to get anything to come up on screen at all.

I don’t have an alternative cpu cooler to try or an alternative psu.

I have built a bunch of systems over the years and have had the occasional hiccup, ram not in hard enough, power connector not seated, additional power connector left out.
I have no ego here, I’m happy for it to be my stupid fault but I am out of ideas, I’m also extremely frustrated that with the money I have spent I can’t play with my new toy.

This is what I bought:

Goods Ordered (prices in GBP)
£66.66 x 1 - Fractal Design Define XL R2 Full Tower Case - Titanium Grey
£208.29 x 1 - Corsair AX1200i Digital ATX '80 Plus Platinum' Modular Power Supply (CP-9020008-UK)
£5.41 x 1 - Arctic Silver 5 Thermal Compound (3.5g)
£341.66 x 1 - Asus Radeon RX VEGA 64 ROG Strix OC 8GB HBM2 PCI-Express Graphics Card
£0.00 x 1 - FREE WITH GX-41V-AS: AMD Raise The Game Fully Loaded Promo - Resident Evil 2, The Division 2 & Devil MayCry 5
£116.66 x 2 - Kingston HyperX Predator RGB 16GB (2x8GB) DDR4 PC4-25600C16 3200MHz Dual Channel Kit
£241.66 x 1 - Intel 760P 1TB M.2-2280 PCI-e 3.0 x 4 NVMe 3D NAND Solid State Drive (SSDPEKKW010T8X1)
£449.99 x 1 - Intel Core i9-9900K 3.6GHz (Coffee Lake) Socket LGA1151 Processor - OEM
£0.00 x 1 - FREE WITH CP-65K-IN: Intel Starter Pack - Call of Duty 4 Black OPS, Killing Floor 2, Evasion & Adobe Bundle
£141.66 x 1 - Seagate 6TB IronWolf NAS 7200RPM 256MB Cache Internal Hard Drive (ST6000VN0033)
£129.16 x 1 - Corsair Gaming™ K95 RGB PLATINUM RAPIDFIRE Mechanical Keyboard, Backlit RGB LED, Cherry MX Speed
£229.16 x 1 - Gigabyte Z390 Aorus Master Intel Z390 (Socket 1151) DDR4 ATX Motherboard
£324.99 x 1 - Dell UltraSharp U2715H 27" 2560x1440 IPS Widescreen LED Monitor - Midnight Grey
£58.29 x 1 - Razer Naga Trinity USB Optical RGB MOBA Gaming Mouse (RZ01-02410100-R3M1)
£137.49 x 1 - Corsair Hydro Series H150i PRO RGB Performance Liquid Cooler - 360mm

YitZxFI.jpg
 
So you've sent this back and they said it all worked fine? Looks like you have tried everything and have the bare minimum plugged in so id be at a loss as to why it wont work for you. Does it not do anything other than give an error code?
 
If I flash the cmos I can get it to play a bit longer but nothing changes it will usually power cycle once and hang at message/error 78 again.

I reseated the cpu while I was waiting for a reply and no dice. I just put the whole system back in the case and tried again, sill hangs at 78

The tech I spoke to said this ram isn’t really 3200, it’s actually Overclocked and sometimes causes issues but that’s only after post in his experience, so you could usually solve that in bios. Oh how I wish I could get to bios.

When I returned the Mobo and cpu I spoke to the tech who was doing the testing and he said he got it running fine, all ram slots, all pcie slots. Booted it to a copy of windows even. I really have no idea what’s going wrong.
 
Well i guess i can only suggest testing with another PSU as that seems to be a common denominator, but you could say that about the ram too! Something tells me to test it all with a different PSU!
 
That’s all I can think of, I just don’t have a spare anymore (moved countries)

The odds on all 4 sticks of ram being bad are just about non existent, so unless they are just not compatible..

The fact the system behaves the same with bare bones and fully built says to me it’s power or ram too.
 
Yeah if OcUK say the mobo and cpu are fine then what you are left with must be the problem. I know the mobo has error code display but do you have a speaker attached to the mobo? sometimes error codes can be wrong but basic beeps can tell you everything :)
 
Grandmaster Fap! said:
Yeah if OcUK say the mobo and cpu are fine then what you are left with must be the problem. I know the mobo has error code display but do you have a speaker attached to the mobo? sometimes error codes can be wrong but basic beeps can tell you everything :)
Click to expand...

I wish I could but, alas, the Mobo didn’t come with one and I have no spare parts :(
 
Tried without nvme? Without kb?

Not exactly faulty psu symptoms. I'd be inclined to get a pair of sticks from the jungle, 30 day return...
 
Last edited:
So I checked it without the two 8 pins again and while screwing around I knocked the monitor and an input select popped up, used a different cable and selected that and up comes bios. I think it was always coming up. I don’t understand how I missed it as I tried two different monitors with different cables. Thanks everyone for the suggestions, you are all responsible for getting it to work imo.
 
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