No Display...

[DrunkenPanda]

I rebuilt a work system today from a Lenovo prebuilt.

 

Reused CPU: AMD Ryzen 7 4750G

Reused Ram: 4x 8GB

New MB: Asus Prime B450m-A II (have already flashed the BIOS at this point)

New PSU: EVGA 80-bronze 750 watt fully modular

New GPU: Nvidia Quadro RTX 5000

New CPU Cooler: Hyper X Evo 212

Reused Storage: 256GB M.2

New Case: Be Quiet something or nother Full ATX

 

Step by step:

- took the motherboard out of the box and placed it on top of the box

- transferred the CPU, fairly carefully, with the arrow pointed properly, wiggled it lightly to seat it, and clamped the clip

- connected the CPU fan, thermal pasted the CPU, and installed the cooler

- installed the RAM, with audible clicks heard on each

- installed the m.2 drive

- reset the standoffs for mATX and screwed the motherboard into the case.

- installed the power supply, clicked in the Motherboard, CPU, and VGA cables

- routed the Motherboard and CPU power supply cables and clicked them into the motherboard

- installed the fans and connected them to the motherboard

- connected the USB 3.0, HD Audio, Power Switch and Power LED +/-

- routed the VGA cable, connected it to the GPU, and installed the GPU

- cable management, and took it down to the shop

- hooked it up, no display

- changed monitors and got a HDMI > DisplayPort cable that was working on a similar system, no display

- took out the RAM sans 1 stick, no display

- decided to take it home... reseated the GPU and checked all the PSU connections, no display

- cleared CMOS, no display

- reseated the CPU and checked the pins, no problem with pins or socket, reinstalled CPU cooler, no display

- flashed the BIOS on the motherboard, no display

- took everything out except the CPU, 1 stick of RAM, no display

 

yes, the cables I'm using work with my main system. it is not the cables. 

 

I've been building computers since I was 15. I'm 37 now.... I have no idea what to even try at this point. I thought about replacing components from my current system but it's a custom loop and that would be a massive pain in the ass...

 

All I can figure is something happened to the CPU? I have no idea what, but I'm open to ideas? My current track is to take it to the computer shop 10 minutes from work and ask if I can use their test bench

[noob0saur]

I see in your list that you haven't tried to connect to the integrated graphic cards on the mobo instead of the GPU, you can try that, also try different output on your GPU, how many HDMI & DP it has? you can try all of them...

[DrunkenPanda]

3 minutes ago, noob0saur said:

I see in your list that you haven't tried to connect to the integrated graphic cards on the mobo instead of the GPU, you can try that, also try different output on your GPU, how many HDMI & DP it has? you can try all of them...

I tried integrated when I removed everything except the CPU, 1 stick of RAM... There's only 1 port on the motherboard for it.... but yea... no display

[noob0saur]

2 minutes ago, DrunkenPanda said:

I tried integrated when I removed everything except the CPU, 1 stick of RAM... There's only 1 port on the motherboard for it.... but yea... no display

Tried all the ports on the Quadro too? do your motherboard happen to have little LED's with error readout (CPU,VGA, RAM) the one that stays lit in red is the one who's causing the problem...

[DrunkenPanda]

2 minutes ago, noob0saur said:

Tried all the ports on the Quadro too? do your motherboard happen to have little LED's with error readout (CPU,VGA, RAM) the one that stays lit in red is the one who's causing the problem...

didn't opt for the fancy mobo.... just wanted something that wasn't going to alarm out cause I didn't connect some random button from the original case... I've tried other ports for the quadro... I just installed three other ones and they all went very smoothly. I can't imagine it's the quadro that is the problem but I could find out fairly quickly tomorrow. I'm fairly convinced its the CPU causing the issue... it's just weird cause it had no bent or missing pins

[noob0saur]

& actually there's two display out on your mobo, VGA & DVI

[noob0saur]

4 minutes ago, DrunkenPanda said:

I just installed three other ones and they all went very smoothly.

You installed three other GPU & it worked fine?

[DrunkenPanda]

4 minutes ago, noob0saur said:

You installed another GPU & it worked fine?

I installed 3 RTX 5000s in different systems and upgraded the PSUs to support them... this one I had to change the case on as the one it was in wasn't big enough to house it. I ditched the motherboard it was on to circumvent having to look up Lenovo documentation to connect to the case etc... I suppose I could open that route back up and return the motherboard if it works cause the current config does not

 

I can't check VGA or DVI on my monitors here, I'm sure work has some shitty ones that would take those connections but I'm fairly certain that isn't the issue

[noob0saur]

2 minutes ago, DrunkenPanda said:

I installed 3 RTX 5000s in different systems and upgraded the PSUs to support them... this one I had to change the case on as the one it was in wasn't big enough to house it. I ditched the motherboard it was on to circumvent having to look up Lenovo documentation to connect to the case etc... I suppose I could open that route back up and return the motherboard if it works cause the current config does not

Yeah maybe it's just a DOA mobo.

[DrunkenPanda]

if anyone was wondering, or if this comes up in the search...

 

I took it to the computer shop to try the CPU on their test bench and it didn't work. We put in a different CPU and it fired right up. We put the CPU back in the original motherboard and it fired right up.

 

As it turns out, Lenovo prebuilts have recently started vendor-locking their CPUs to the motherboard
https://www.servethehome.com/amd-psb-vendor-locks-epyc-cpus-for-enhanced-security-at-a-cost/

...... because anybody needed that... in a desktop... ever... .... ...