Security policy

[Skofab]

Unfortunately I have messed up my lenovo g510 win 8.1 laptop.
Somehow I have altered something, and now I get a message window to say efi dvd is blocked by security policy.

How can I overcome this problem. All help and suggestions welcome
Thanks

 

[TechnoMage]

I'm really surprised that no-one had replied to your post in almost a month. Sorry about that! And, Welcome to the 8.1 forum.

This may not help, but it's definitely a suggestion. Eh mate?

I'm a real NO-Nonsense PC operator and 40 yr + computer builder/Tech. So one of the first things I do after setting up a new OS, is back it up, so if I mess it up later, I can just do a C: drive restore and be back where I was, before I, or something, messed it up.
So I'm assuming you didn't do that. Eh?

Failing to have a clean backup, I'd just save all my data files off of that drive and then RE-Install Windows. I keep every version of windows, on Flash Drives, for a quick install.
That's never what someone with a problem wants to hear, but hey, it fixes ALL the problems.

Please let me know how you're doing.
Cheers Mate!
TM

 

[starvinmarvin]

What about resetting the CMOS?
Unplug power cord.
Remove battery. Hold down power on/off button for 10 seconds.
Remove bottom panel screws.
Locate and remove CMOS battery.
Wait a few seconds then reinsert the CMOS battery.
Reinsert main battery. Turn the computer ON and see if that cures the issue.

 

[TechnoMage]

Ahem!
A few seconds will NOT reset the CMOS on 99% of PC's. Sorry Charley!
I've adopted 30 minutes as the appropriate time delay for resetting the CMOS, after ALL power has been removed from the PC, (and also remove the Main Battery from laptops)
And, if the CMOS battery that has been removed, does not check out to 3.0 volts DC, on a digital volt meter, trash it and put in a new one.
Anything less than 3.0 volts, means the battery is going down and definitely should be replaced.

 

[starvinmarvin]

Ahem!
A few seconds will NOT reset the CMOS on 99% of PC's. Sorry Charley!
I've adopted 30 minutes as the appropriate time delay for resetting the CMOS, after ALL power has been removed from the PC, (and also remove the Main Battery from laptops)
And, if the CMOS battery that has been removed, does not check out to 3.0 volts DC, on a digital volt meter, trash it and put in a new one.
Anything less than 3.0 volts, means the battery is going down and definitely should be replaced.

Maybe we can compromise on the time needed to reset. According to Intel it should be:

How to Clear CMOS to Reset BIOS Settings in Systems with Intel®...

Defines CMOS technology and how to clear CMOS using the jumper or battery methods.

www.intel.com

 

[TechnoMage]

Oh for good sakes! Can't you find something to do for 30 minutes? Clean out the cooling fan, or something. Or do you just want to argue?
I've been at this stuff for over 40 years, on hundreds of PC's, and YES, I've tried lesser times and found that the CMOS memory did not fully reset to ZERO.
And nobody wants a partially RESET CMOS memory.

 

[starvinmarvin]

I've only been at this computer thing for about 38 years; thus, I must bow to your vastly superior experience. By the way, thanks for reminding me to clean the cooling fan ....
Not the first one I worked on, but the first one I owned:

 

[TechnoMage]

That keyboard looks awfully familiar. But my work with computers goes all the way back to 1964. There were NO PC's, and a Computer filled a house.
All too often, a repair involved the littlest things. One tiny little diode could take down a multi-million dollar system.
And a dirty stick of RAM in a PC, can take that system down too. I've saved a ton of ram, by just washing it. And a few video cards too.
Full replacement is way down, on my list of things to do, to fix a computer.
And I use a needle point oiler, to re-lube cooling fans, to get several more years use out of them. I can't remember, the last time I actually replace a fan.

Marvin, you don't say, where you are or what kind of computer you have. You might want to add that to your Profile.

Cheers Mate!

 

[Barman58]

A lot of modern motherboards now have a CLRTC Pin (from Clear Real Time Clock) which you just short out for a few seconds to save thirty minutes - Time is precious these days, unless you're a millennial

 

[starvinmarvin]

That keyboard looks awfully familiar. But my work with computers goes all the way back to 1964. There were NO PC's, and a Computer filled a house.
All too often, a repair involved the littlest things. One tiny little diode could take down a multi-million dollar system.
And a dirty stick of RAM in a PC, can take that system down too. I've saved a ton of ram, by just washing it. And a few video cards too.
Full replacement is way down, on my list of things to do, to fix a computer.
And I use a needle point oiler, to re-lube cooling fans, to get several more years use out of them. I can't remember, the last time I actually replace a fan.

Marvin, you don't say, where you are or what kind of computer you have. You might want to add that to your Profile.

Cheers Mate!

I cleaned a very dirty laptop in the dishwasher once. Strangely, it refused to boot up afterwards. Subsequently, the owner decided to take my original advice and buy a new one.

 

[TechnoMage]

It's not the washing that hurts them, it's the water you leave behind after the wash. I regularly wash ram and even video cards, but I rinse them in alcohol to displace the water and then dry them thoroughly before Powering them up. Washing is actually the last step in PC board manufacture. I used to make PC boards, professionally.
I can actually think of a few parts of a laptop that should NOT go through a Dish Washer. (the screen and keyboard, come to mind)

Cheers mate,
TM

 

[SCANNERMAN]

Ahem!
A few seconds will NOT reset the CMOS on 99% of PC's. Sorry Charley!
I've adopted 30 minutes as the appropriate time delay for resetting the CMOS, after ALL power has been removed from the PC, (and also remove the Main Battery from laptops)
And, if the CMOS battery that has been removed, does not check out to 3.0 volts DC, on a digital volt meter, trash it and put in a new one.
Anything less than 3.0 volts, means the battery is going down and definitely should be replaced.

This is so true. Seems only people who've been building and working with PCs for decades know this for a fact and aren't opposed to stating it. Half an hour is nothing in this day and age where most folks own two or three PCs, laptops or whatnot. PC should be completely shut off, power cable pulled if possible, then hit power switch to drain any residual power from the caps. Pull the battery and just for kicks you could jumper it to remove any teensy weensy traces of charges left in components. Be sure to reset those pins just as you found them 20 to 30 min later and make sure you have 3.0 volts in that battery before you put it back or replace it. Power cord back to PSU and turn power supply back on before engaging power switch on case. 20 to 30 minutes is more than ample time make good use of 1) cleaning any dust out of the case with a rubber tip vacuum nozzle, 2) Reseating RAM, 3) Checking all cards and additional hardware, 4) tightening up, trimming, or replacing/rerunning cables for a neater, more practical look. Before you know it you'll be ready to reset your system. OR you can just hop on your spare laptop and do emails for 20 minutes or so. Yup. electricity can sit in a disconnected system board for half an hour quite easily depending on the unit. I find draining the caps usually fixes the issue quickly but waiting half an hour, especially in this day and age, is no big deal.