Mini pcie card to ethernet not working boot loop


Limp Gawd
Jun 16, 2017
I wanted to add a second Ethernet port of my computer so i bought a mini pcie card to ethernet

I installed it, and when i boot the computer I see the post message then it goes black and boots up again and i see the post message, it just keeps doing that, a boot loop

if i take out the card, it boots fine to the OS, i looked in the bios and enabled the card, but it still does the boot loop, if i disable the card in the bios it boots to the OS, but then i cant use the second port, as it's disabled

if i enable the card in the bios, and plug a ethernet wire, the lights on the card work, but it boot loops so i cant even get into the OS,

So, it doesn't work, i dont know why, anyone have any ideas?

It's a HP T520 Flexible Thin Client, I looked in the specs of the thin client and it says:



Pictures of BIOS:
PIC1.png PIC2.png PIC3.png PIC4.png PIC5.png


In the specs it says:

Support existing CAT-5 UTP cabling with automatic crossover detection
Fully compliant with PCI-Express Base Specification Revision 1.1
Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps
Compatible with PCI-E Mini Card Electromechanical specification revision 1.2
Compatible with Half size Mini card type form factor
Fully Plug and Play compatible
A high performance 1000BASE-T Ethernet controller card
Backwards compatible to 10/100BASE-T networking
10/100/1000Mbps data rate auto negotiation operation
Compatible to existing CAT-5 UTP cabling
Fully compliant with IEEE 802.3, 802.3u, 802.3ab
Supports full duplex flow control (IEEE 802.3x)
Supports IEEE 802.1P Layer 2 Priority Encoding
Supports IEEE 802.1Q VLAN tagging
Supports jumbo frame to 9K bytes
Crossover Detection and Auto Correction operation

System Requirements
Windows ME,98SE, 2000, XP, Vista, 7 and 8 32-/64-bit
Windows Server 2003, 2008 and 2012 32 -/64-bit
Linux, DOS MAC OS X 10.4.X or above

Package Contents
Gigabit Ethernet Mini PCI-Express Card - Main card x1
Gigabit Ethernet Mini PCI-Express Card - Daughter card x1
User manual x1
Driver CD x1
10-pin network cable x1
4-pin LED cable x1


[H]F Junkie
Jul 31, 2005
I'm guessing HP has that slot locked down to specific wireless cards. What OS is it running?


Limp Gawd
Jun 16, 2017
I have a couple of them, so i tried them both on linux mint and windows 7, but i cant get past the post message on both


Limp Gawd
Jun 16, 2017
Is there specifc HP mini-pcie etherner cards for HP only? I can't seem to find any info online

Im going to try the card in a non-HP desktop i hace lying around to verify that it's not the cards itself. But i have 4 of them and all 4 of them do that

So it's HP the problem?
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