Hi,
Is HP replacing the card and is your system under warranty?
Try a different HDMI cable. Try a DVI cable. There is really not much left to try.
If the system is under warranty, HP will either replace the graphics card or send a new card to you which you can install.
Jaco
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H8 1380t CTO, Intel i7 3820
16 GB DDR3
Pegatron Motherboard- IPIWB-PB (Pittsburgh), Radeon HD 7570 1GB. Win 7 Home Premium upgraded to Windows 8.1 Pro.
Envy Phoenix 810-150se, Intel i7 4820k
12 GB DDR3
Pittsburgh2 Mainboard, NVIDIA GTX 645- 2GB GDDR5. Win 8.1 Pro.
HP 560z CTO AMD processor and chipset,
16 GB DDR3.
Radeon HD 6570
Win 7 Home Premium upgraded to Win 7 Pro.
HP ENVY 17t-j000 CTO Quad Edition Notebook. Win 8.0 Pro