victorluan

Hello, I went to my friend's recently, tested it on both a laptop and a desktop. We concluded it's the problem of the PE4L board. I've tried your suggestions, but Setup 1.x couldn't detect my eGPU at all. Then I tested my eGPU setup on my friend's laptop. The laptop started up normally, but got blue screen every time when logging into Win 7. Then we tested the GPU on the desktop, everything was just fine with it. Thinking it's the problem of the PE4L board, we plugged in a Radeon HD6850 (connected to an external LCD meanwhile). The laptop started up with screen on, but eLCD's screen off and the laptop stuck when loading Win 7. Finally, we changed the original 420W PSU to a 750W PSU. The PSU wouldn't even power up (might because of a protection scheme). Therefore we believed it's the problem of PE4L board.

After I ran Setup 1.x (I use USB disk to launch it), it said eGPU is not detected, and said sth about setting 7/15s video card delay time... And if I click turn dGPU off, after reboot, the dGPU is still shown in device manager. So I manually disabled and uninstalled dGPU in device manager, shut down, turned on eGPU, and last turned on laptop, black screen as usual. I wonder what issue would make the laptop black screen/no screen on even before passing BIOS? Besides, I'd surely check my eGPU on a desktop soon.

I have my 2 6-pin PCI-E cables connected to the GTX 660Ti (actually 1 should be enough); I believe everything else is well connected. I tried fixing the PM060A cable in its position by pressing it myself, which didn't help... A weird thing is after I changed to another 4-pin floppy power cable, my laptop would start up normally even if my eGPU was on at first place (or maybe that's just coincidence). Still, my laptop just didn't detect the eGPU. Probably I'll have my PSU and GPU tested on desktop in a few days although I don't really think there's any thing wrong with the power. I also found D1 and D3 refer to 'power' and 'detect' respectively. So is my power supplied sufficient (D1 green) and PCI-E x1 detection false (D3 orange)? If so, does it mean my PSU works just fine? Thanks!

I tried the steps you suggested. Still not working... Here's what I've done by order: 1. Laptop off; D1(green), D3(orange)&D4(red) on; eGPU fan low rpm. 2. Laptop on; D4 off; eGPU fan low rpm; no screen on, no HDD activity. 3. SW1 (on ATX power switch) 1-2 -> 2-3; D1&D3 on; no screen on, no HDD activity. 4. Restart laptop (eGPU off), laptop -> normal. 5. Laptop on; SW1 2-3 -> 1-2; eGPU fan max rpm; scan in device manager -> still no detection. 6. SW1 1-2 -> 2-3; laptop -> off; SW1 2-3 -> 1-2; D1, D3&D4 on, eGPU fan max rpm. 7. Laptop on; laptop -> normal; no detection... I think the laptop detects sth anyhow since every time I turn on eGPU before laptop, the screen is not on. It doesn't even pass the BIOS because there's no HDD activity further on. The colours of D1, D3 and D4 are green, orange and red.

Thanks for your reply! I'm using Win8 64-bit Pro. I bought PE4L PM060A, which seems to merge the mPCI-E adapter and PCI-E cable into one. Because it's too short, I can't reach the screw point... Hence I used tape to fix it (I'm pretty confident it's in its position). By the way, I've seen this on the website: Dupont 2PIN Cable. What's this for? I didn't receive such... I'll try the steps you said soon.

I may have quite similar problems as you do. My specifications: XPS L502X (Sandy Bridge HM67) PE4L v2.1b PM3N GTX 660 Ti 420w modular PSU with 2x6pin PCI-E port These are my setup descriptions: 1. In no way could Windows device manager or eGPU Setup 1.x detects the GTX 660 Ti. 2. When I turn on my PSU, the GTX 660 Ti would run consequently but the fun of it is in very low rpm. 3. And if I turn on my laptop later, the screen is black screen, before the Dell logo is shown. 4. The eGPU fan is either in max rpm or min rpm. 5. Usually, D1 (green) and D3 (orange) light up; D4 (red), D3 and D1 light up sometimes. Update: Whenever I shut down my laptop, the fan of the eGPU tunes from max rpm to min rpm. I changed mPCI-E port from WWAN to the one for WLAN, still no detection of eGPU. I guess that's either my eGPU's or PE4L's problem. Does anyone have suggestions? Thanks in advance!