Lenovo ThinkVision Pro2840m 4K no DisplayPort signal on POST

Hi all,
I have a pair of the Lenovo ThinkVision Pro2840m 4K monitors since about 4 days ago, and very unfortunately I am encountering a lot of issues which I will be posting in separate messages.
My configuration is as follows:
System: Lenovo ThinkStation S10 with BIOS ver. 2WKT47AUS
Graphics: NVIDIA GTX670 by POV with BIOS ver. 80.04.19.00.04
OS: Windows 7 Enterprise x64 ver. 6.1.7601
NVIDIA: Drivers 331.82 (but have same issue with 332.21/337.88/340.43)
ThinkVision Display: Microcode LN3.01 with display driver ver. 1.0.0.0 (10/09/2013) installed
Connection: Cable connected on the DisplayPort of the display and on the DisplayPort of the GPU with the included in the box DP-DP cable. No other displays are connected to the GPU other than the Pro2840m.
Issue: No video signal during POST on DisplayPort
When powering on the PC, the display detects a video signal (else it would show 'DP No Connection - Check Signal Cable) and its power indicator goes from orange to green, then the 'Power Saving Mode' sign comes on (in the meantime the PC is going through POST) then the sign goes off and the power indicator turns back to orange. Then when the windows booting process is complete, the power indicator goes back from orange to green and the monitor displays the windows login screen.
As a consequence of this I can not enter the BIOS and RAID settings. It is obvious that I need to be using the DisplayPorts on both the GPU and display because only then I will be able to run 4K@60Hz. So switching to use other connectors on the GPU (even if they would provide signal) is not an option, as I will need to be swapping cables on and off each time I need to restart the PC just to keep an eye if for instance one of my RAID arrays has failed.
I really would appreciate it if anyone else having this display can replicate or has this problem too. Maybe someone from Lenovo support can ask their colleagues to try this with a similar setup to verify the issue.
If I have any updates I will certainly post them here on the OP.
Solved!
Go to Solution.

UPDATE
2 Days ago I received my second pair of the Lenovo Pro2840m 4K monitors with a newer manufacturing date (21-06-2014) compared to the first pair (20-05-2014). It turns out that the new pair have very pleasantly a newer firmware running.
Microcode LN3.06 appears to have addressed the major issue of no DisplayPort signal during POST. I have tested and can confirm to all interested that when running LN3.06 the issue is no longer present during a cold startup, restart/reboot and resume from hibernation.
I want to thank the dedicated hardware team behind the ThinkVision line, and I will proceed to obtain the new Microcode for my first pair of screens as well.

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    ROM Revision: 3436
    gMux Version: 1.7.10
    Displays:
    Color LCD:
    Resolution: 1920 x 1200
    Pixel Depth: 32-Bit Color (ARGB8888)
    Main Display: Yes
    Mirror: Off
    Online: Yes
    Built-In: Yes
    IBM C220P CRT:
    Resolution: 1280 x 1024 @ 85 Hz
    Pixel Depth: 32-Bit Color (ARGB8888)
    Mirror: Off
    Online: Yes
    Rotation: Supported

    Hi, I had the same issue and resolved it by getting rid of extra converters or adapters. What I mean is I went VGA from my monitor to a mini-dispaly VGA piece and into the MBP. Before I did it like that I was going VGA from my monitor to VGA-DVI-D adpater then to a mini-display DVI-D piece. I did that because I had an extra mini-display to DVI-D piece that I wanted to use instead of going out and buying a new kind. I called Apple support and they suggested that I scratch the VGA-DVI-D conversion to keep the conversions to a minimum. I plugged up the new mini-display to VGA piece and it worked like a charm! I have a MBP 15" (Late 2009) and the external monitor is a hp vs15. It worked for me. I dont know if you use any extra adapters like the kind I was using. If you do I suggest trying the hook up without it. Good Luck!

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