Specific information is almost impossible without being there and seeing the cables and board together, but your situation is not hopeless.

You are very lucky that you have the panel connector pinout silkscreened on your mobo. It's also obvious that you already designated power LED, HDD LED, reset switch, turbo switch, and keylock connectors. So, your unidentified two pin connector is turbo led, and the other unidentified 2 wire/4 pin connector is speaker.

According to your first photo:

11*--- Power LED and Key Lock
22*
33* 
44*
55*---
61*--- Speaker 
72* 
83*
94*---
101*--- Reset Sw.
112*---
121*--- Turbo LED
132*---
141*--- Turbo Sw.
152*---

Starting from the bottom

First 2 pins: Turbo switch. Turbo switch connectors generally come as 3 pin/3 wire connectors, but with only two pin receptors on the mobo. You need to try and find the correct connection. There are only 2 possibilities for your mobo as far as I can see. Attention: Only two pins to two wires, one wire will not be connected.
Next 2 pins: Turbo Led. Again you need to try. Only 2 possibilities, but if your Turbo led connector has white/orange wires, try putting orange to the pin designated as "1" first.
Next 2 pins: Reset Switch. You can connect both ways, both will work
Next 4 pins: Speaker. You can connect both ways, both will work.
Next 5 pins: Power LED + Key Lock. You need to try. I would start with green (most probably) wire of 3 pin power led connector to the pin designated as "1".

Do your trials one by one. You can't harm your mobo by trying the connection possibilities, as long as you connect the connector to the designated pins.

HDD LED connector has nothing to do with your mobo, since your mobo has no onboard IDE controller. This connector should be connected to your IDE controller / multi I/O card.

Thanks for quick reply.
And now what I've got after your suggestion:
PSU works, hdd spinning, light on on the floppys, clock showing 08 mhz ?, pressing turbo switch not giving change.
2 times got green screen, then nothing.
Checked with 3 vlbus cards and 3 other isa cards and same results. So mobo possible death ? or you have different idea ?
Thanks
clayster

clayster wrote:

Thanks for quick reply. And now what I've got after your suggestion: PSU works, hdd spinning, light on on the floppys, clock sho […]
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Thanks for quick reply.
And now what I've got after your suggestion:
PSU works, hdd spinning, light on on the floppys, clock showing 08 mhz ?, pressing turbo switch not giving change.
2 times got green screen, then nothing.
Checked with 3 vlbus cards and 3 other isa cards and same results. So mobo possible death ? or you have different idea ?
Thanks
clayster

I can't have an idea about whether it is dead or not, but I will suggest a barebones testing first. CPU, minimum amount of RAM, an ISA display card, nothing else connected. "nothing else" includes no other cards, no front panel connectors, no drives of any kind. If you can get the boot up screen with that setup, you can continue from there, by trial and error, making a single change at a step.

If you can't get the boot screen with that setup, you have some problems from serious ones like mobo being dead, or as simple as a wrongly adjusted jumper. Do you have the mobo manual? I suggest finding it and check all the jumpers are adjusted properly. Especially related to CPU type/speed and Cache.

By the way, by minimum RAM I mean 4 identical sticks (you have 30 pin SIMM sockets and your machine will work only if you install your memory in multiples of 4). In the picture, I see that you have 6 RAM slots populated, so it will probably will not work like that. I suggest removing the 2 extra sticks.

Sadly looks the mobo is dead no sign of life, I have removed 2 sticks of ram, put isa vga card and nothing else. 🙁
Anyway thanks for your advice.

Hey,
Just wanted to add that i have two 486 mobo's which i thought were dead, but it turned out that i had to connect a keyboard too. Without one nothing happened, no video output, not even a post beep. I suggest you try that too?

Yes, keyboard was connected, so motherboard dead 🙁

Could still be mis-jumpered, or CMOS battery dead (good news: RTC block will not spill acid, bad news: it's difficult to replace without the appropriate equipment)