Question New GPU installed but no monitor display ?

[David's Hardware]

Hi. Technophobe here. This is my PC -

Operating System
Windows 10 Pro 64-bit
CPU
Intel Core i5 2400 @ 3.10GHz 41 °C
Sandy Bridge 32nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)
Motherboard
Hewlett-Packard 1494 (SOCKET 0)
Graphics
Standard Monitor (1920x1080@60Hz)
2048MB ATI AMD Radeon R5 310 (Sapphire/PCPartner) 40 °C
Storage
232GB Western Digital WDC WDS250G2B0A-00SM50 (SATA (SSD)) 25 °C
465GB Seagate ST3500413AS (SATA (SSD)) 29 °C
232GB Seagate ST3250312AS (SATA (SSD)) 27 °C
2794GB Western Digital WD Elements 107C USB Device (USB (SATA) ) 34 °C
Optical Drives
hp DVD A DH16ABLH
Audio
Realtek High Definition Audio

I have installed a Gigabyte GTX 1060 6GB G1. It is currently being powered by a PSU separate from the PC's PSU. Although the separate PSU has plenty of wattage, I get the dreaded 'PLEASE POWER DOWN AND CONNECT PCIE POWER CABLE.......'. The gpu went into the slot the old one came out of, closest to the CPU. Have checked that the GPU is seated well, and that the power cable is secure at both ends. The GPU powers up, the fans spin, and I get a nice little flashing white led on the card.
Where to from here? TIA David

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[Aeacus]

Hi. Technophobe here.

Due to technophobia, my best suggestion would be to haul your ancient rig to PC repair shop and pay them for diagnostics and fix.

But based on your info, you'll need new PSU at minimum. But since your rig is ancient and should be in e-waste long time ago, you may need to get a whole new PC.
Since your MoBo is HP, it may be proprietary, which may need proprietary PSU as well. And with such an old PC, i don't think you can find any better PSU for it.

It is currently being powered by a PSU separate from the PC's PSU.

Bad idea. Possibly the source of all your issues.