I’ve used cases from Corsair, Fractal, Phanteks and be quiet! for various pc builds, and prefer the be quiet! ones by a long way. Very good build quality, everything fits really nicely, useful accessories and generally very well thought out. Lots of details on their website and availability from the usual decent outlets in the U.K. like Scan, Overclockers etc. Shop around and check Amazon too as prices do vary.
Modular power supplies allow you to fit only the cables you actually need, which can be surprisingly few in a modern pc build, as opposed to having them all hard wired from the supply, resulting in the need to find space to bundle loads of wires out of sight.
My current pc uses the be quiet Dark Power Pro 12 1200 watt, which is silent and efficient.
Thanks - modular power supplies sound like what i need ... i have thick bundles in my case, and i suspect the new drive/bluray drive are busing against a bundle and nudging a connector.
The spec when bought was:
Processor (CPU) - Intel® Core™ i5 Six Core Processor i5-9400F (2.9GHz) 9MB Cache
Motherboard - ASUS® H310M-A R2.0: Micro-ATX, DDR4, LGA1151, USB 3.1, SATA 6GBs
Memory (RAM) - 16GB Corsair VENGEANCE DDR4 2400MHz (2 x 8GB)
Graphics Card - 6GB NVIDIA GEFORCE GTX 1660 - HDMI, DP - GeForce GTX VR Ready!
1st M.2 SSD Drive - 256GB ADATA SX6000 Pro PCIe M.2 2280 (2100 MB/R, 1200 MB/W)
1st Storage Drive - 2TB SEAGATE BARRACUDA SATA-III 3.5" HDD, 6GB/s, 7200RPM, 256MB CACHE
Power Supply - CORSAIR 450W VS SERIES™ VS-450 POWER SUPPLY
Processor Cooling - CoolerMaster Hyper 212X (120mm) Fan CPU Cooler Black Edition
Sound Card - ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Wireless Network Card - WIRELESS 802.11N 300Mbps/2.4GHz PCI-E CARD
USB/Thunderbolt Options - MIN. 2 x USB 3.0 & 2 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS
Since then the network card was swapped, Bluray added and an additional HD added.