Simulator launches with black screen after deleting files.

Hi,
I am building an iPhone app on xcode 5 and everything have been going on very well. I deleted a view controller and it's files a couple of days ago and ever since whenever I run the app the simulator shows a black screen.
Could this problem be caused because I deleted those files?
How can I fix this?
Thank you.

This is obvious.
App runs fine.
You make a change.
App no longer runs fine.
Undo the change.

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Hi Autoexit173,
Welcome to Lenovo Community!
As per the query we understood that you are facing issue with system not booting in your Lenovo G560 laptop.
As you have mentioned that the system not booting, please try to remove the RAM and turn on the system and check if you can hear any beep sound. Also try to clean the RAM slots and check for the issue.
Click here for the steps to remove the RAM and refer page number 40.
Hope this helps. Do post back if issue persists!
Best regards,
Ashwin.S
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Hoping somebody can help, I've spent like the last two days straight at the genius bar without success. When I boot up I see my profile and the guest, it boots as normal (not the delayed boot with black screen others have mentioned), but then I log in, see my desktop, icons, and then the screen goes black.
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In both cases I can tell the computer is still on because the backlit keyboard stays lit.
I've tried resetting nvram, smc, deleting the library cache file, doing a reinstall without wipe, and I only have one partition/HD so it's definitely the default boot disc.
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Hoping somebody can help, I've spent like the last two days straight at the genius bar without success. When I boot up I see my profile and the guest, it boots as normal (not the delayed boot with black screen others have mentioned), but then I log in, see my desktop, icons, and then the screen goes black.
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I can boot into safe mode, and occasionally boot up regularly after being in safe mode for a bit.
I had the display replaced due to a physical defect just before this happened, but I also got 10.10.3, which I know has caused graphics glitches for other people.
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Mac users often ask whether they should install "anti-virus" (AV) software. The usual answer is "no." That answer is right, but it may give the wrong impression that there is no threat from what are loosely called "viruses." There is a threat, and you need to educate yourself about it.
1. This is a comment on what you should—and should not—do to protect yourself from malicious software ("malware") that circulates on the Internet and gets onto a computer as an unintended consequence of the user's actions.
It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the computer, or who has been able to take control of it remotely. That threat is in a different category, and there's no easy way to defend against it. AV software is not intended to, and does not, defend against such attacks.
The comment is long because the issue is complex. The key points are in sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user. Internally Apple calls it "XProtect."
The malware recognition database used by XProtect is automatically updated; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
☞ It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
☞ It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't been checked for security by Apple unless it comes from the App Store, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
☞ It can easily be disabled or overridden by the user.
☞ A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
☞ An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
Apple has taken far too long to revoke the codesigning certificates of some known abusers, thereby diluting the value of Gatekeeper and the Developer ID program. Those lapses don't involve App Store products, however.
For the reasons given, App Store products, and—to a lesser extent—other applications recognized by Gatekeeper as signed, are safer than others, but they can't be considered absolutely safe. "Sandboxed" applications may prompt for access to private data, such as your contacts, or for access to the network. Think before granting that access. Sandbox security is based on user input. Never click through any request for authorization without thinking.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is effective against known threats, but not against unknown ones. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. The built-in security features of OS X reduce the risk of malware attack, but they are not, and never will be, complete protection. Malware is a problem of human behavior, not machine behavior, and no technological fix alone is going to solve it. Trusting software to protect you will only make you more vulnerable.
The best defense is always going to be your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "Trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and Internet criminals. If you're better informed than they think you are, you'll win. That means, in practice, that you always stay within a safe harbor of computing practices. How do you know when you're leaving the safe harbor? Below are some warning signs of danger.
Software from an untrustworthy source
☞ Software with a corporate brand, such as Adobe Flash Player, doesn't come directly from the developer’s website. Do not trust an alert from any website to update Flash, or your browser, or any other software. A genuine alert that Flash is outdated and blocked is shown on this support page. Follow the instructions on the support page in that case. Otherwise, assume that the alert is fake and someone is trying to scam you into installing malware. If you see such alerts on more than one website, ask for instructions.
☞ Software of any kind is distributed via BitTorrent, or Usenet, or on a website that also distributes pirated music or movies.
☞ Rogue websites such as Softonic, Soft32, and CNET Download distribute free applications that have been packaged in a superfluous "installer."
☞ The software is advertised by means of spam or intrusive web ads. Any ad, on any site, that includes a direct link to a download should be ignored.
Software that is plainly illegal or does something illegal
☞ High-priced commercial software such as Photoshop is "cracked" or "free."
☞ An application helps you to infringe copyright, for instance by circumventing the copy protection on commercial software, or saving streamed media for reuse without permission. All "YouTube downloaders" are in this category, though not all are necessarily malicious.
Conditional or unsolicited offers from strangers
☞ A telephone caller or a web page tells you that you have a “virus” and offers to help you remove it. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
☞ A web site offers free content such as video or music, but to use it you must install a “codec,” “plug-in,” "player," "downloader," "extractor," or “certificate” that comes from that same site, or an unknown one.
☞ You win a prize in a contest you never entered.
☞ Someone on a message board such as this one is eager to help you, but only if you download an application of his choosing.
☞ A "FREE WI-FI !!!" network advertises itself in a public place such as an airport, but is not provided by the management.
☞ Anything online that you would expect to pay for is "free."
Unexpected events
☞ A file is downloaded automatically when you visit a web page, with no other action on your part. Delete any such file without opening it.
☞ You open what you think is a document and get an alert that it's "an application downloaded from the Internet." Click Cancel and delete the file. Even if you don't get the alert, you should still delete any file that isn't what you expected it to be.
☞ An application does something you don't expect, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
☞ Software is attached to email that you didn't request, even if it comes (or seems to come) from someone you trust.
I don't say that leaving the safe harbor just once will necessarily result in disaster, but making a habit of it will weaken your defenses against malware attack. Any of the above scenarios should, at the very least, make you uncomfortable.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it—not JavaScript—in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a padlock icon in the address bar when visiting a secure site.
Stay within the safe harbor, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself.
7. Never install any commercial AV or "Internet security" products for the Mac, as they are all worse than useless. If you need to be able to detect Windows malware in your files, use one of the free security apps in the Mac App Store—nothing else.
Why shouldn't you use commercial AV products?
☞ To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. This technique is a proven failure, as a major AV software vendor has admitted. Most attacks are "zero-day"—that is, previously unknown. Recognition-based AV does not defend against such attacks, and the enterprise IT industry is coming to the realization that traditional AV software is worthless.
☞ Its design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere. In order to meet that nonexistent threat, commercial AV software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
☞ By modifying the operating system, the software may also create weaknesses that could be exploited by malware attackers.
☞ Most importantly, a false sense of security is dangerous.
8. An AV product from the App Store, such as "ClamXav," has the same drawback as the commercial suites of being always out of date, but it does not inject low-level code into the operating system. That doesn't mean it's entirely harmless. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
An AV app is not needed, and cannot be relied upon, for protection against OS X malware. It's useful, if at all, only for detecting Windows malware, and even for that use it's not really effective, because new Windows malware is emerging much faster than OS X malware.
Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else. A malicious attachment in email is usually easy to recognize by the name alone. An actual example:
London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
You don't need software to tell you that's a Windows trojan. Software may be able to tell you which trojan it is, but who cares? In practice, there's no reason to use recognition software unless an organizational policy requires it. Windows malware is so widespread that you should assume it's in every email attachment until proven otherwise. Nevertheless, ClamXav or a similar product from the App Store may serve a purpose if it satisfies an ill-informed network administrator who says you must run some kind of AV application. It's free and it won't handicap the system.
The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user, you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither can you assume that you will always be safe from exploitation, no matter what you do. Navigating the Internet is like walking the streets of a big city. It can be as safe or as dangerous as you choose to make it. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

[SOLVED] Black screen after GRUB

Hello everyone
I was setting up a machine with E17 and was trying various DM's since none seemed to work. After attempting to use LightDM, I get a black screen after GRUB. I was trying to read the various logs at /var/log/ but I cannot understand them properly. I tried reinstalling entrance and LightDM with no luck. I even tried editing grub's entry appending '1' or 's' and still no dice. Any help would be appreciated.
Last edited by Linoman (2014-01-20 09:22:33)

Hi tnx for both answers.
I missed something important in Xorg.log. As you can see, fbdev and modesetting aren't loading as usual. I didn't check grub stuff, I don't think it's related, since loading in level 3 (text mode) I get a black screen but I can login as root and turn off the computer blindlessly.
[ 2.969] (II) LoadModule: "modesetting"
[ 2.969] (WW) Warning, couldn't open module modesetting
[ 2.969] (II) UnloadModule: "modesetting"
[ 2.969] (II) Unloading modesetting
[ 2.970] (EE) Failed to load module "modesetting" (module does not exist, 0)
[ 2.970] (II) LoadModule: "fbdev"
[ 2.970] (WW) Warning, couldn't open module fbdev
[ 2.970] (II) UnloadModule: "fbdev"
[ 2.970] (II) Unloading fbdev
[ 2.970] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 2.970] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
GM45, 4 Series, G45/G43, Q45/Q43, G41, B43, HD Graphics,
HD Graphics 2000, HD Graphics 3000, HD Graphics 2500,
HD Graphics 4000, HD Graphics P4000, HD Graphics 4600,
HD Graphics 5000, HD Graphics P4600/P4700, Iris(TM) Graphics 5100,
HD Graphics 4400, HD Graphics 4200, Iris(TM) Pro Graphics 5200
[ 2.970] (II) VESA: driver for VESA chipsets: vesa
[ 2.970] (++) using VT number 7
[ 2.974] (WW) Falling back to old probe method for vesa
javex wrote:Post the content of the following files:
Also does disabling LightDM again help resolve the issue, i.e. can you get it to work without LightDM?
No, I can't get it to work changing DM's. I'm not sure if I pacman -Syu before changing DM's another time. Maybe it wasn't LightDM's fault afterall.
Spider.007 wrote:Additionally; try booting without the 'quiet' entry that is in the kernel line by default; and disable https://wiki.archlinux.org/index.php/Ke … de_Setting too
Thanks for pointing out that. I didn't knew I had it on.
Last edited by Linoman (2014-01-11 21:34:08)

GTX670 - Signal lost/black screen after windows loading icon

Hello,
I hope I am posting this in the correct forum area. If not I do apologize.
Here are my specs:
Board: MSI Z97-G45 Gaming
Bios: ?? whatever pre-installed on mobo
VGA: MSI GTX670 OC
PSU: Corsair HX750 750W
Intel Core i7-4790K
MEM: 12 GB Kingston HyperX DDR3 1600 2x 4GB, 2x 2GB sticks
HDD: SSD Kingston 120 GB (Win7), HDD 1 TB WD 7200 RPM (Win7), HDD 1.5 TB WD 7200 RPM (storage)
COOLER: Corsair Hydro Series H60 Water Cooler
OC: no overclocking done by me..default settings
OS: Windows 7 64bit Professional
So to keep this as direct and as short as humanly possible here is my situation.
Had a gtx670 card that I had to send back to MSI under RMA. They sent me what looks like a new gtx670 card (no dust) that I received yesterday (4 Aug). Last night I removed temporary old card (9800gt) and plugged in new 670gtx. Things seemed to be ok, reinstalled driver after card was recognized. Played one round of Battlefield 4 for testing purposes and all seemed good.
Upon exiting the game things went south in a hurry. Moving the mouse cursor around was extremely slow and choppy. Mouse clicks were not recognized. I could not bring up ctrl-alt-del to get to task manager. At this point the cursor turned to spinning circle as if things were happening. However, after 5+ minutes of nothing changing I did a hard boot.
Restarted and after the windows loading screen the signal appeared to be lost to the monitor and I was left with black screen. This was with the SSD. I then attempted to load into the HDD windows OS that I hadn't logged into yet with this card and was greeted with the same issue.
I can load into Safe Mode with no issues. In safe mode I removed all nvidia drivers and was then able to load into windows normally using basic windows vga drivers. The moment I load the Nvidia drivers and restart the computer I then have the issue again. This happens with both drives.
I have reset the video card in the PCI-Ex16 slot and still received the problem. I have tried a different PCI-Ex16 slot and still had the issue. I put the old 9800gt card back in and windows loaded perfectly and without issues on both drives. I put the 670gt in and try to load into normal windows and I lose signal and get black screen after the windows loading screen.
I'm at a loss at the moment. I think it's the drivers, but could it be the card?
Doing some research I've come across some people saying there may be issues with the nvidia HD audio drivers that are installed with the video drivers. Could it be as simple as uninstalling or unchecking that particular driver?

Flashed the BIOS last night to the latest version and attempted to launch windows with the GTX670 card. I still experienced the same issue where as soon as windows finishes it's loading animation (with Nvidia drivers) and it goes to the login screen, the monitors cut out.
At this point I feel like it has to be the card. The moment I install the video drivers and restart, I have the problem of losing the signal/black screen.
What I have done:
1) Completely wiped any/all video related drivers from the computer and started from scratch. No success.
2) Ran Memtestx86 to see if it's a problem with my memory sticks. No problems found.
3) Put the card in a different PCI-Ex16 slot to see if there was a problem with the slot. No success.
4) Flash updated the BIOS on the motherboard to the latest version. No success.
I have a dual boot computer with Windows 7 64-bit installed on an SSD and a HDD. The problem happens on both drives. Yet, the moment I install my old 9800GT the problem disappears and I can login to Windows just fine.
I will be sending the card back today on another RMA.

MSI R9 270X - Black Screen after Win7 logo

Hello there.
About a week ago I upgraded my PC, buying several components and putting it to work. Here's the specs.
Main Board: M5A97 EVO R2.0
Bios Version: Latest
Video Card: MSI Radeon R9 270X TwinFrozr OC Edition 2Gb
PSU: Don't know
12v rail Rating of listed PSU:
CPU: AMD FX 8350 4.0Ggz BE SkAM3+
Memory: 8Gb Crucial Ballistix DDR3-1600Mhz
SSD/ HDD: Western Digital WD10EZRX-00A8LB0 1TB
CPU COOLER: The one that came with the CPU
Raid Card: Onboard
Sound Card: Onboard
OC: (Yes / No) Don't know
Operating System: Win 7 SP 1 64
So, it worked just fine for about 3 days. Last Saturday night I tried to open Google Chrome after some gaming and the the system froze. I got a screen with vertical black and white stripes. I had to reboot the system and it gave me a black screen, crashing again, after the Win Logo at start up. At this time I was running either 14.7 or 14.9 ATI drivers.
I could only start the PC on Safe Mode. Removing the drivers and getting Windows general VGA card settings would allow me to use Windows in normal mode though. Once I installed the Graphic Card's drivers it crashed on reboot, always with the black screen after Win logo. I installed several ATI drivers, namelly 14.9, 14.11 beta, 13.12... and nothing worked.
I flashed the Mother Board BIOS to the latest version, formatted the HDD doing a fresh install of Win 7, installed Catalyst first and then the drivers, the drivers without catalyst, etc. and nothing worked, always getting a black sreen on reboot once the Graphic Card's drivers were installed. I even swapped the Graphic Card to a different slot to no avail.
Right now I'm using my old Radeon HD 5670 with the latest drivers and everything works just fine. It even works fine if I keep both Graphic Cards installed with the monitor plugged to the older card. I find this odd since to do so, Windows loads both cards drivers with no errors. But once I switch to the new card everything goes black.
Can someone help me out? I've tried to contact my vendor's technical support through mail but they're not answering. I fear that I'll have to report it as DOA and swap it out, which will take quite some time taking into consideration the way things tend to work around here.
EDIT - I don't have a 2nd system to test it on.

Nope. Not driver issue at all. I tested at least 3 different drivers, all with the same result. Besides, I used both Driver Fusion and Driver Cleaner and CClean to remove any non-deleted registry entries. Always got the same problem. Went as far as formating the drive and doing a clean Win install. The problem persisted.
Tried installing drivers without Catalyst to no avail. Tried installing Cataltst first and then the drivers. Nothing. It always crashed omce the drivers were installed.

Simulator launches with black screen after deleting files.

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