Illrunyou

I just recieved my Motherboard back from a RMA, Gigabyte Z370 AORUS Gaming 7. Before I sent it off I did not have either of these problems. The H100i Platinum will illuminate just fine if I do a fresh boot to BIOS. Once I boot to the desktop however it will start to flicker. The other issue I am having is the PC with not boot if i have my RAM in the 1 / 2 slots but will if i have them in the side by side 2 / 4. Once again i did not have this issue when i first had it. I have X.M.P enabled and still no resolution. RAM is the 3200 8GB stick Trident z x2. MB: GIGABYTE Z370 AORUS Gaming 7 CPU: Intel i5 9600k RAM: F4-3200C16D-16GTZR GPU: GIGABYTE GeForce RTX 2070 GAMING M.2: Samsung 970 EVO Plus Series - 250GB PCIe NVMe - M.2 Internal SSD PSU: EVGA SuperNOVA 650 G3 OS: WIndows 10 64 bit

Hello all! So i just purchased all new parts to make a gaming PC. The motherboard I got is the Gigabyte Z370 Gaming 7. The processor I got is the i5-9600k. Unfortunate to me i was under the impression id be able to get to the BIOS and update the MB to support the new CPU with just booting with a USB in. No luck so I'm pretty sure I need to find an 8th Gen supported 1151 CPU and boot first. The code I am receiving on the board is 18. Does anyone know if this is the culprit or if there is something else going on? Parts: Intel - Core i5-9600K 3.7 GHz 6-Core Processor Corsair - H100i RGB PLATINUM 75 CFM Liquid CPU Cooler Gigabyte - Z370 AORUS Gaming 7 (rev. 1.0) ATX LGA1151 Motherboard G.Skill - Trident Z RGB 16 GB (2 x 8 GB) DDR4-3200 Memory Samsung - 970 Evo 250 GB M.2-2280 Solid State Drive Gigabyte - GeForce RTX 2070 8 GB GAMING 8G Video Card Fractal Design - Meshify C TG ATX Mid Tower Case EVGA - SuperNOVA G3 750 W 80+ Gold Certified Fully-Modular ATX Power Supply