How to open IBM computer, no latches/screws

May 12, 2011 at 05:28:06
Specs: DOS 6.0 Win 3.1, 486SX/33
Hi, I have obtained an excellent working vintage old computer that I bought aditional RAM for but then I can't get the *&$E$ cover off to get inside!

IBM 486SX/Si-K50 .

Made in about 1993

Online hardware manual is here:

My photos of all 6 sides of the computer is here:

The hardware manual says: ""The PS/ValuePoint computer top-cover assembly slides onto the base frame and is held in place by the cover-release latch (or latches) and cover lock. Before moving the computer, make sure that the cover is latched and the cover lock is in the locked position.""

But after a long examination I do not see any latches.

By the way, I have taken many covers off computers in the past including ones older than this one, but I havn't a clue how to get the cover off of this one!!


I did a search here and found an old thread

There was message saying "then you'll need to find a key for it, or else break the lock off (which is actually quite easy to do)."

But the lock cylinder is flush with the front panel, there is not way to get a tool next to the cylander to pry. Anybody know how to go about breaking off a cover key lock on an old IBM?

And where are those latches hidden?

Thanks for any advice!


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May 12, 2011 at 06:01:32
Check the BIOS so pc's have a magnetic lock that can be turned off in the BIOS.

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May 12, 2011 at 07:13:58
Your photo of the back is zoomed in to show the model tag so we can't see the entire back. That said, I assume if there were any screws there you would see them. Are there screws in the center of the rubber feet? Looks like the case should slide of to the rear. Perhaps there are some tabs on the plastic front bezel that you need to release and then the cover will be free to slide of to the rear.

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May 12, 2011 at 07:22:40
just had a look at the pics think i saw one of these before do the case not slide off, so face the front hands on either side and push back? if not it will most likely be maget lock. you many need to put ur hands near the back and put ur figers over the edge so the you can use your finder tips to push teh main case towards you while your palms grip the outside.

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Related Solutions

May 12, 2011 at 08:55:57
I see a lock on the front......Picture 5 just below cdrom.These locks usually only have three tumblers and are easy to pick. You need two safty pins. One to bounce the tumblers up and down (rapidly) and one to turn the lock......counter clockwise.

Looks like two tabs on the on each side...push or pull down.

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May 12, 2011 at 08:57:37
surely that lock only allows you to take the face plate off thou?

could always drill it :D

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May 12, 2011 at 15:17:01
Thanks, everybody!

Worldlibrary wins the intelligence test which I flunked :0.

There are two tabs, underneath the front bezel, you can see them right by the 2 front feet. And even I can see them now :/

The lock was unlocked. But thanks also for the pic tips, the lock was easy to jimmy with pins!

The lock would keep the entire top cover from sliding, the IBM hardware manual calls its a safety feature! Manual didn't describe the latch tabs, probably thought it was obvious :/

Best part of these old systems, boot up is 8 seconds to desktop!

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May 12, 2011 at 16:58:07
Hey, I mentioned tabs too, LOL.

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