Cooling Fans will not start anymore

Thank you volcanoscout.
Indeed, when I checked the cables from the 3 fans were not just unseated , they were totally loose. Unfortunately through that hole of 1 inch x 3/4 inch I cant fit 2 fingers to plug them. I cant even see inside; my case, a Fractal Design Refine R4. I removed front panel and 2 fan panel and cant access that small cubicle behind front panel on the right side. The right panel side is also removed. I certainly hope that thre is a way to open up that area to be able to plug. I do not see how.

Do you have any more suggestions as to how to get to the connectors?

I did not notice if it booted to the Bios or not at that time.

The CPU fan works normally.

Until I solve the fans issue i set an external fan.

When i switched the PC on and temperatures were(as per Speccy report):
CPU 42C,
Motherboard 28C
Intel SSD 23C (with the OS)
Raid 1 (2 x 500GB HDDs) 21C
HDD 2 23C
HDD 3 21C
HDD4 23C (the Seagate 5900 rpm)

After 5 hrs of PC operation temperatures were (in the same order sequence)
46C
28C
24C
23C
28C
28C
33C1 (the Seagate 5900 rpm)

As soon as I switched on the PC i also switched on an external fan pointed (right side of the case has been removed) to the drives and somewhat to the back plate of the motherboard facing the right side of the PC.

Yesterday without no exterior fan the highest temp after 5 hours was for a Seagate HDD drive 5900 rpm (the last one on today's list) Speccy read was 51C

Thank you for your help

Answering the last part of the quote above when i tried to install the Discrete GPU, i still had my monitor set to work connected to HDMI cord and receptacle.

to volcanoscout,

THANK YOU! Very, very much
It finally worked, I followed your instructions step by step (which gave me a lot of confidence knowing where to "touch")
Even with the front panel all the way forward it took me several tries before I found the seat and it slide in snuggly.

I am very appreciative of your efforts to put yourself in my position as someone(me) who does not know what to do.
All 3 fans: 2 in front and 1 in back panels are now working and with less noise (no noise now) than it had before and still with the 2 sides of the case removed. So when I am finally done and the sides back on it would be totally silent.
Now the temps of the storage drives is now higher than when i had the external fan so, after the graphics card MAYBE I would have to add something stronger as a 4th fan.
I have been checking Noctua 14 units. Now, as I have ran out of slots in the fan controller I would have to plug it elsewhere.
I know that the connector is fundamental, which kind of fan should I need to buy? Is 3 pin and 4 pin the same cause they are referred to for the same model as in the first one listed below:
A. Noctua NF-A14 FLX 900-1200RPM 115.5M3/H 19.2DBA 3-pin connector 140mm Fan square Frame -$23@Ncix-
4 pin Molex
B. Noctua NF-P14 FLX Ultra Silent 140 mm Fan (Brown) simple round frame $20@Amazon &Ncix
C. Noctua NF-A14 industrialPPC-2000 IP67 PWM -$35@ncix- (97667)
D. NF-A14 industrialPPC-2000 -$32@ncix- (97668) 3-pin onnector
E. Noctua NF-A14 Industrial PPC 3000 PWM 140mm Cooling Fan 800-3000RPM 4 Pin Molex $32@Ncix
Over 2000rpm could become noisy and also I think that for my system is an overkill although price wise is more bang for my buck than the NF-A14 industrialPPC-2000 at the same $32 price.

Which one/s would you choose and why? Are they all compatible with my system in terms of "connector" availability?
Do they connect to motherboard or PSU?
As you know there are 2 slots for fans in front panel, now populated with 2x140mm Silent series from Fractal Design bringing air into the case, the back panel 140 mm also Silent from Fractal for exhaust out air from case
Then there are another 3 slots to place the 4th.one: two on the roof of the case and one on the floor of the case.
Should a 4th one become necessary, where would you place the Noctua one, in the place of one of the front one?, or as exhaust? or where?



Thank you again for taking me under your wing to help me out.


Notes:
After 2 hours of operation with me working at the keyboard, the temperatures reading from Speccy say:
- CPU oscillating between 45 and 48C in quick succession
- Motherboard: permanently at 28C (it has never changed since I remember)
- Intel 530Series SSD 240GB 29C (is this not too hot for a drive that has no mechanical move?)
- Raid 1 Volume (2 x 500GB WD Blue) 28C
- WD20Earx (green with lower rpm) 2TB 28C
- Seagate Green 5900rpm 2TB 39C
- Hitachi Desktar 1 TB 35C
- WD 1002FAEX 1 TB 42C

With the current high prices to replace HDDs I would rather extend their life span by lowering those temperatures to under 30C(if at all possible) thus the Noctua thoughts. I am even thinking to take advantage of WD's policy to replace -at no cost for me- 2 Black ones just before the 5 year warranty would be expiring. They assure me they do not refurbish their HDDs so I would be getting brand new ones with better current technology than the versions I now have.

What do you think of the temperatures?

Re-reading your detailed instructions about the Graphic Card now, 1:30 am Eastern time in here now. I will tackle the issue when fresh early morning today Wednesday.

Cheers.