After the computer stood for 8 years in a warehouse, we tried to turn it on.
When turned on, there is no image on the monitor and the keyboard does not respond to key presses
Has anyone encountered this problem before?
Everybody has these kinds of problems.
When you leave most high tech gear in a warehouse for nearly 10 years, of course the circuit board, the pins, the internal clock battery on the mobo, just about everything is either dead or corroded.
Why would you ask such a question like "Has anyone encountered this problem before?" ?? 
Everyone and anyone who tries to use gear stuck in a warehouse somewhere, turned off for nearly a decade, will have the same problem.
Take the computer to a computer repair shoo and ask them to clean it using ultrasound cleaning techniques and to clean all the pins, ports, etc and change any battery on the mobo, etc!
Watch it during power-on.
Does the fans run?
Do you hear a short beap?
Does a light on the keyboard flash?
Then, if you hit numlock key, does the light lit?
Use the VGA analogue outlet to see the initial console with some information.
fans run, i hear a shot beap
a light on keyboard don't flash
monitor connected by vga, but no image...
Thank you, I didn't even know it was that simple...
The first thing to do with any tool / equipment / gear like that is to clean it BEFORE you plug it in. Otherwise, if there is any moisture inside or otherwise moisture damage you will have more problems after you power it on.
Clean and inspect first. Power on later
the warehouse is dry, there is no moisture, so there is no rust on the motherboard.
inspection was done beforehand.
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That's good to know
Is there a small round clock / firmware battery on the motherboard?
Did you clean the ports, both on the computer and keyboard / monitor sides, with contact cleaner?
we just brushed it, there is no plaque
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A dead battery would not cause no display unless it had gone short-circuit and was therefore holding voltage line down.
How do you know that key presses aren't being responded to if you cannot see anything?
Does the monitor you are using have a power light on it? Have you tested the monitor on another platform to know that it works? Is it the original Sun monitor?
For that matter, is the keyboard a Sun keyboard? Or a third-party keyboard?
The circle that you've drawn on the image you posted is not clear. Is there a battery holder there with no battery in it?
Does the system power up? Tell us exactly what happens? Do the fans all run? Bear in mind that some hardware issue or even just an interlock microswitch on the lid might tell the system that the lid is off so not to start.
Take those memory DIMMs out and put them back in to reseat them. A poor memory connection can make a system seem dead.
Unclip that processor chip and reseat that too.
Disconnect any/all disk drives both power plug and bus cable whilst trying to get a display working.
Remove any add-in cards (apart from the graphics card if it's not on-board). A faulty add-in card might hold down bus lines making the system appear dead.
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All these manipulations have already been done.
the monitor is working.
keyboard SUN
when turned on, the CAPS, NUM, SCROL lock lights do not light up.
all boards and disks are removed.
after turning on, after a few seconds, a sound signal, the fans are spinning, but there is no image
upd after 10 min working workstation
an image appears and responds to STOP+A
now I will connect the HDD and try to turn it on
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That looks like full diag. If the NVRAM builtin batt gets low, it loses its settings, then diag-switch defaults to on and diag-level to full. And boot-device might default to "net".
However, shouldn't a monitor show something from the beginning.? I have seen these boxes but "diag-switch?" has always been "off".