AS rock b450 gaming itx/ac post issue undervolt

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   I have a AS rock b450 gaming itx/ac paired with a 2600X and a RedDragon 5700XT. I recently transferred this build to a Kolink Rocket case.

The CPU temps were a bit high as I changed the CPU cooler so I tried to undervolt. -50mv offset did not do much so I tried a -100mv offset. That is when the PC stopped posting.

I cleared the cmos, left the cmos battery unplugged, left it for hours, changed ram configs etc. A few hours later when playing with the RAM, it posted!! No idea how, BIOS was reset and everything looked fine. I changed the XMP profile back to original 3000 mhz and rebooted two times. Everything looked good.

I launched red dead 2 and it crashed. Since then, mobo is back to not posting. Not sure where the problem is now. I have tried clearing CMOS and unplugging HDD/fans etc to try and limit any hardware issues. No luck.

My BIOS is 3.20. Here is a full list of my hardware. 

PCPartPicker Part List: https://pcpartpicker.com/list/PtX8rV

CPU: AMD Ryzen 5 2600X 3.6 GHz 6-Core Processor  (Purchased For ??99.00) 
CPU Cooler: Noctua NH-L9a-AM4 33.84 CFM CPU Cooler  ($39.90 @ Amazon) 
Motherboard: ASRock Fatal1ty B450 Gaming-ITX/ac Mini ITX AM4 Motherboard  (Purchased For ??28.00) 
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory  (Purchased For ??54.00) 
Storage: Samsung 860 Evo 1 TB 2.5" Solid State Drive  (Purchased For ??58.11) 
Storage: Seagate BarraCuda 4 TB 2.5" 5400RPM Internal Hard Drive  ($115.94 @ Amazon) 
Video Card: PowerColor Radeon RX 5700 XT 8 GB Red Dragon Video Card  (Purchased For ??45.00) 
Case: KOLINK ROCKET Mini ITX Desktop Case  (??80.00) 
Power Supply: Corsair SF 600 W 80+ Gold Certified Fully Modular SFX Power Supply  (Purchased For ??19.00) 
Monitor: Acer XF270HU 27.0" 2560x1440 144 Hz Monitor  (Purchased For ??20.00) 
Total: $155.84
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-12-01 05:15 EST-0500

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EatDahPewPEw Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 01 Dec 2019 Location: Europe Status: Offline Points: 3	Post Options Post Reply Quote EatDahPewPEw Report Post Thanks(0) Quote Reply Topic: AS rock b450 gaming itx/ac post issue undervolt Posted: 01 Dec 2019 at 6:17pm
	I have a AS rock b450 gaming itx/ac paired with a 2600X and a RedDragon 5700XT. I recently transferred this build to a Kolink Rocket case. The CPU temps were a bit high as I changed the CPU cooler so I tried to undervolt. -50mv offset did not do much so I tried a -100mv offset. That is when the PC stopped posting. I cleared the cmos, left the cmos battery unplugged, left it for hours, changed ram configs etc. A few hours later when playing with the RAM, it posted!! No idea how, BIOS was reset and everything looked fine. I changed the XMP profile back to original 3000 mhz and rebooted two times. Everything looked good. I launched red dead 2 and it crashed. Since then, mobo is back to not posting. Not sure where the problem is now. I have tried clearing CMOS and unplugging HDD/fans etc to try and limit any hardware issues. No luck. My BIOS is 3.20. Here is a full list of my hardware. PCPartPicker Part List: https://pcpartpicker.com/list/PtX8rV CPU: AMD Ryzen 5 2600X 3.6 GHz 6-Core Processor (Purchased For ??99.00) CPU Cooler: Noctua NH-L9a-AM4 33.84 CFM CPU Cooler ($39.90 @ Amazon) Motherboard: ASRock Fatal1ty B450 Gaming-ITX/ac Mini ITX AM4 Motherboard (Purchased For ??28.00) Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory (Purchased For ??54.00) Storage: Samsung 860 Evo 1 TB 2.5" Solid State Drive (Purchased For ??58.11) Storage: Seagate BarraCuda 4 TB 2.5" 5400RPM Internal Hard Drive ($115.94 @ Amazon) Video Card: PowerColor Radeon RX 5700 XT 8 GB Red Dragon Video Card (Purchased For ??45.00) Case: KOLINK ROCKET Mini ITX Desktop Case (??80.00) Power Supply: Corsair SF 600 W 80+ Gold Certified Fully Modular SFX Power Supply (Purchased For ??19.00) Monitor: Acer XF270HU 27.0" 2560x1440 144 Hz Monitor (Purchased For ??20.00) Total: $155.84 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2019-12-01 05:15 EST-0500