I just took delivery of an RPi5, case and power supply from Pimoroni today. Fitted the Pi in the case and powered it on, but it doesn’t seem to want to boot. Nothing appears on the HDMI output, and the green LED flashes repeatedly in a 4 slow - 5 quick cycle. Fan runs normally.
Full LED sequence when power is applied:
STEADY RED - for 1 sec
STEADY GREEN - for 5 secs
FLASHING GREEN - 4 slow, 5 fast flashes, pause for 2 secs, then repeat
The SD Card is a brand new SanDisk Extreme Pro, which I flashed using the Raspberry Pi Imager v1.8.4. I initially chose the Raspberry Pi OS (64 bit, recommended). When that gave the above result, Id downloaded the tarballs for Bookworm (arm64 and armhf), checked the SHA256 hashes (all good), then extracted and flashed each in turn, using the “Use custom” option on the imager. In all cases, the image was verified successfully, so I assume the SD card is fine. Th result on powering up was exactly the same.
Can anyone suggest what the problem might be? I’ve not seen any info on the net about the flashing LED pattern and what it might mean. Thanks in advance!