AB350 Pro4 - No POST - SOLVED

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   Welcome to the forums 
First up, great post, you listed your specs, what is happening and what you have tried already in a very clear and easy to understand way, thanks.

Power cycling on Ryzen systems is almost always memory related, either the RAM is not supported or the CPU IMC isn't being correctly identified (CPU not supported). Given your symptoms and specs the first thing to check is the sticker on your BIOS chip. It isn't always replaced when boards are flashed post production but if it was it will help rule out CPU support. If the sticker states an old BIOS version (pre 4.xx) then the next step is to check if the serial number on the board matches the one on the box. Sometimes returned boards get put into the wrong box and resold by retailers, this can lead to a "Ryzen 2000 Series Ready" labeled board not actually supporting the new(er) APUs.

If that all checks out then the next thing to look at is RAM. I see you have already tried one stick but you did not mention if you tried it in each slot. If you have not already go ahead and try each module, one at a time, in each of the slots and see if you get post with either. Checking your RAM on Corsair's website does not list support for any AMD platforms. That doesn't strictly mean it isn't supported but it does mean Corsair have not verified compatibility themselves. Another issue is that RAM manufacturers will often "update" RAM models with different RAM chips and a new revision will not necessarily be compatible with an older one. When they run out of a particular RAM chip they frequently can't get the same chips in again and have to change to another type or brand.

RAM specs from Corsair website: https://www.corsair.com/uk/en/Memory-Size/Tested-Speed/vengeance-lpx-black/p/CMK16GX4M2B3200C16

Note only intel is listed as supported.

It is encouraging that the kit is listed on the Raven Ridge QVL but that only means it is compatible with the CPU IMC, not necessarily the motherboard. 

AB350 Pro4 memory QVL: https://www.asrock.com/mb/AMD/AB350%20Pro4/#Memory

Click the drop down tab under "Vendor" and select Corsair to narrow down the list and you will see your RAM is not officially supported on this board. That said, I have noticed that most manufacturers do not update these lists very often and ASRock is no exception, you may require a newer BIOS to support it.

I hope this is of some use to you, good luck and post back with your findings 

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Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 26918	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 26 Sep 2018 at 1:52pm
	Welcome to the forums First up, great post, you listed your specs, what is happening and what you have tried already in a very clear and easy to understand way, thanks. Power cycling on Ryzen systems is almost always memory related, either the RAM is not supported or the CPU IMC isn't being correctly identified (CPU not supported). Given your symptoms and specs the first thing to check is the sticker on your BIOS chip. It isn't always replaced when boards are flashed post production but if it was it will help rule out CPU support. If the sticker states an old BIOS version (pre 4.xx) then the next step is to check if the serial number on the board matches the one on the box. Sometimes returned boards get put into the wrong box and resold by retailers, this can lead to a "Ryzen 2000 Series Ready" labeled board not actually supporting the new(er) APUs. If that all checks out then the next thing to look at is RAM. I see you have already tried one stick but you did not mention if you tried it in each slot. If you have not already go ahead and try each module, one at a time, in each of the slots and see if you get post with either. Checking your RAM on Corsair's website does not list support for any AMD platforms. That doesn't strictly mean it isn't supported but it does mean Corsair have not verified compatibility themselves. Another issue is that RAM manufacturers will often "update" RAM models with different RAM chips and a new revision will not necessarily be compatible with an older one. When they run out of a particular RAM chip they frequently can't get the same chips in again and have to change to another type or brand. RAM specs from Corsair website: https://www.corsair.com/uk/en/Memory-Size/Tested-Speed/vengeance-lpx-black/p/CMK16GX4M2B3200C16 Note only intel is listed as supported. It is encouraging that the kit is listed on the Raven Ridge QVL but that only means it is compatible with the CPU IMC, not necessarily the motherboard. AB350 Pro4 memory QVL: https://www.asrock.com/mb/AMD/AB350%20Pro4/#Memory Click the drop down tab under "Vendor" and select Corsair to narrow down the list and you will see your RAM is not officially supported on this board. That said, I have noticed that most manufacturers do not update these lists very often and ASRock is no exception, you may require a newer BIOS to support it. I hope this is of some use to you, good luck and post back with your findings


VolatilePulse Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Sep 2018 Location: USA Status: Offline Points: 8	Post Options Post Reply Quote VolatilePulse Report Post Thanks(0) Quote Reply Posted: 26 Sep 2018 at 11:36am
	Update: The RAM kit that I originally received was DOA. After an RMA for a replacement kit, it worked. Placing the RAM in slots A2 and B2 on the motherboard should allow the system to POST (granted you have good RAM). If you're going to enable the XMP profile for the RAM and are using an APU, be aware it hasn't been tested by the manufacturer for that specific scenario. While the APU and the MoBo can both handle the XMP profiles, the 2 together apparently don't work together as expected. I ultimately had to set the RAM speed to 3133 after loading the XMP profile instead of the 3200 it is rated for. Just be aware your mileage may be different. Full solution can be found here: http://forum.asrock.com/forum_posts.asp%3FTID=9764&PID=56644&title=ab350-pro4-no-post#56644 ---------- Hey guys, new to forum and new to PC building. This is my first rig but I've been around computers my whole life and understand quite a bit in regards to building computers. I've repaired damaged components and even upgraded and flashed computers for the military. That being said, I'm savvy but far from perfect. I finally got all my parts in today and with my work schedule didn't get a chance to install them until ASRock had closed for the day. I spent the last several hours troubleshooting and attempting to figure out what's going on that I can't get this machine to POST. The PC turns on, I get a Power LED indicator, the CPU and chassis fans spin up for about a minute, then the system power cycles, indefinitely with no display. First, I'll include my hardware list, then I'll cover the troubleshooting tips I've tried. Parts: Motherboard: ASRock AB350 Pro4 Rev 1.03 (Ryzen 2000 Series Ready) CPU: Ryzen 5 2400G PSU: Corsair VS550 550W RAM: Corsair Vengeance LPX 16GB (2x8GB) 3200Hz CMK16GX4M2B3200C16 DIMM Slots A2 & B2 Case: Corsair 200R Storage: ADATA 256GB SSD Western Digital 1TB HDD Everything was originally plugged into the MoBo when I first turned it on but have since disconnected almost all case and storage plugs on the motherboard. This board has no LEDs or buzzer so troubleshooting has become incredibly difficult. The board specifically shipped with the Ryzen 2000 Series Ready Sticker on it and was promised that indicates it should work the new APUs as well, including the 2400G I'm using. The RAM modules are not only listed on the Raven Ridge QVL, but they are also supposed to run at their listed speed with no issues. If you missed it above, they are installed into the priority slots (A2 & B2). I have tried removing both, reinstalling, trying different slots as well as trying only one stick. No changes in behavior. I have unplugged and plugged the 8pin (4+4) CPU power connector back in (specifically marked as the CPU power connector on the cable as well) and did the same for the 24 pin cable. I ensured that both are completely down with no gaps. The APU literally fell into its socket with 0 force. Once the bar was lowered, it did not move an inch. The fan installed relatively easily minus a bit of sliding while attempting to secure it to the back plate. The RAM modules make a sort of velcro or zipper sound when installing, but I hear an audible click from the "fixed" tab, then continue to press in the non fixed tab which also clicks and closes by itself. The RAM doesn't move once installed and both clicks are heard regardless of stick or DIMM slot. I have 2 different monitors, which were purchased new recently and verified to be good prior to installation. I have tried VGA, DVI, and HDMI. No changes in behavior. I have tried resetting the CMOS a few times as well. Im seriously at a loss here as the only thing I can't verify is that the MoBo actually supports my APU. Please, if there is any support you can provide, I'd be ever grateful. I do plan on contacting ASRock eventually, but work prevents me from doing so as I'm on the other side of the nation and work the hours they're open. Will also try any ideas you can think of and provide any necessary pictures or other details. Edit: Clarified the use of the 4+4 CPU power connector. Edit 2: Added RAM Model Number. Edited by VolatilePulse - 01 Oct 2018 at 2:05pm