No video signal on startup

I have a MacPro, but I use a Samsung 225BW monitor. Recently I'm experiencing no video signal when I startup. I hear the mac "loading" but the monitor alternately flashes the message "analog" and "digital". These messages occur for a few seconds then the monitor goes black and the monitor power light begins to flash. (The monitor exhibits the same behavior if I shut down the mac but forget to turn off the monitor.....so I assume this issue is due to a lack of signal from the mac.) Usually if I restart (once or twice), I get the grey mac "loading" screen and everything is ok. I've checked my cable connections and everything seems to secure. Any ideas or troubleshooting suggestions?
(btw - I recently had an airport extreme card installed. I don't know if this could be related?)

Sounds like you have the cables in order. You're likely running the monitor in VGA mode using APple's DVI-VGA adapter. If you have a DVI cable you could try running a straight DVI connection. This might help.
Reseating the card isn't that hard. Assuming it's not an ATI X1900, just unscrew the two PCIe bracket screws that hold the card to the case. Then you should be able to wiggle it free from the motherboard. Once it's out, check for excessive dust or anything in the PCIe port. Then, put it back in ensuring a snug, uniform fit. Re-attach the screws to the PCI bracket and away you go!
Sounds like this might be the issue altough installing an Airport card does not require the graphics card to be removed.
Making another attempt at zapping PRAM might also prove helpful.

Similar Messages

Mac Mini boot issue, chime, but no video signal.

Hello,
I'm repurposing an older MacMini for use as a home media server. The machine specs are as follows:
2.53mHz//2x2G/320/SD/AP/BT
I have:
1. Removed Airport/Bluetooth card -- they serve another purpose -- the unit will be hardwired to my LAN.
2. Upgraded HD to 500 GB, and installed Lion. Everything worked fine, I put the project on hold for a couple months to work on other things.
I went to install the unit on the wall the other day. Before I did I decided to power it on once more to check all was well before mounting it.
All of the connections appear to be fine, however... when I power the unit on, I hear the chime but never get any video signal. I've tried both:
VGA output using Mini-DVI to HDMI Adapter -- my existing Apple TV supports and this is how I got Lion Installed -- so I know the cables are good.
Worred that perhaps the Mini-DVI port was bad I also tried the:
Mini DisplayPort output with a VGA adapter, same result. I hear the chime and then nothing happens.
My next steop is to attempt to SSH into the Mini from anther machine. Before I go this route: Any ideas what I should be looking for or intermediate steps?
Any help would be appreciated.

I'd try the SSH and view the logs for last startup, or maybe Target Mode if SSH doesn't work.

Laptop will boot... backlight turns on... but no video signal

Hello!
(I searched but couldn't find a situation quite like mine, so sorry if this is a repost.)
After dropping my iBook, I busted the bezel/clutch. The unit powered up, including a fully functional display, but the lid just opened a little screwy.
So, I had the bezel/clutch replaced by an IT buddy, and when everything was reassembled, the unit would still boot up, the backlight would turn on, but there was no video signal! We thought maybe the VGA cable got messed up in the process, so we had it swapped out. Same problem.
Any ideas? Any thoughts if this problem is related to: http://discussions.apple.com/thread.jspa?threadID=877652&tstart=60 ?
I got a heck of a deal on this thing, so I'm thinking about just connecting to an ext. display, backing up everything, and parting it out on eBay. But this was my first Mac, and I only had it for a week, so if there's an easy/economical fix, I definitely want to give it a go!
Thanks folks!
Lance

Lactoes,
This is from Apple:
"Display
No display, or dim display, but computer appears to operate correctly
1. Remove any connected peripherals.
2. Try known-good power outlet, power adapter and power cord.
3. Press F2 (with the fn key pressed and not pressed) to increase the screen brightness
setting.
4. Reboot the computer—hold down the Control and Command keys and press the
Power button, or press and hold the Power button for 5 to 10 seconds to shut down the
computer, then press the Power button to restart.
5. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
Warning: Resetting the power manager means you will also need to reset the
date and time (using the Date & Time control panel).
6. Reset PRAM (Press the power button, then hold down the Option-Command-P-R
keys until you hear the startup chime at least one additional time after the initial
startup chime).
7. Verify backlight cable and LVDS cable connections are seated properly and that the
cables are not damaged (refer to display assembly replacement instructions).
8. Replace display.
9. Verify cable connections and check cables around the hinges for damage.
10. Replace logic board."
The LVDS cable:
922-6368
922-6432 (SS)
Check this out:
http://www.pbparts.com/shop.php/9226432
apparantly there were two versions of this cable the first and the ss.
Even so you should get something. Try the external monitor and report back.
Richard

GTX 670 Power Edition gives no video signal

Hoping somebody can help here. I've had a long string of problems which seemed graphics card related. Initially, the problem that Windows would reboot with no error message or warning of any kind about a minute after logging in. No problems in safe mode nor any problem if I set Windows to start in Diagnostic Mode. Advice at the time suggested doing a system repair from my installation CD but didn't have time to do this before going on holiday. On return, the problem had deteriorated (or a new problem appeared) - there was no video signal, not even the BIOS screen.
At this time my graphics card was an NVidia GTX 580, motherboard a Gigabyte GA-X58A-UD3R, I-7 950 CPU, 850W XFX PSU.
I ran through a host of tests to eliminate possible causes:
1. Tried the card in all PCI_E slots but still no video.
2. Tried another card (NVidia Quadro) in all PCI-E slots, system booted successfully with video and could login to Windows (difference here is the Quadro is powered directly from the motherboard).
3. Tried a number of DVI cables with both cards, the Quadro worked with all of them the 570 stubbornly refused to give a video signal.
Decided the problem was either the PSU or the GTX 580. Returned the latter under warranty and purchased the MSI GTX 570 PE. Installed this and again no video signal but ran through the above tests again with exactly the same results. However could now test the 570 on another system (could not try this with the 680 as PSU on my other system only had 2 6-pin PCI-E connections and the 580 required an 8-pin and a 6-pin power connection). The 570 at least produced the BIOS screen, booted Linux and presented a login screen. Didn't login as the PSU on this system was probably on the marginal side for wattage.
Decided then that I had a strange PSU problem. It could power my PC with the Quadro, suggesting motherboard, CPU, RAM and disks were all OK but could not provide sufficient power for either the 580 or the 670 cards. Bought a new 850W PSU and have just installed this with the 670 card in and yet again I get no video signal. I am now stumped as to what the problem can be so would welcome any suggestions as to what may be wrong and/or what else I can try.
Thanks,
George

Quote from: Svet on 16-November-12, 06:48:32
then you should contact mainboard vendor about it as problem is not in the VGA.
I had given what I thought was sufficient information about the PC spec in my first post. Both what I started with and what I'd changed. But I'll give the full spec here:
Motherboard: GA-X58A-UD3R Rev 2.0
CPU: Intel I-7 950 3.06 GHz
Memory: 3x4GB Crucial DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.5V • 512Meg x 64
Disks: Samsung 64GB SSD SATA System disk
WD 1TB and 500GB SATA drives
PSU: Coolermaster RS-850-SPHA-D3 80+ Gold - 3.3V:22A, 5V:25A, 12V:70A single 12V rail
GPU: MSI GTX 670 2GB OC Power Edition
OS: Windows 7 Professional 64-bit
The changes were the PSU and the GPU. The problem started when I had an XFX Black Edition 80+ Bronze PSU and a Gigabyte GTX 580 GPU otherwise the rest of the spec was and has remained the same. With my original spec, it ran perfectly happily for almost 2 years but then started with the system rebooting without warning about a minute after login (it would stay at the login screen indefinitely). After running some tests the clues seemed to point to the GPU configuration having been corrupted in some way (from sfc logs). However, if I set Windows to Selective startup, I could login and the system would stay up. I decided to do a system repair from my Windows 7 installation disk but had to postpone this for a couple of weeks during which time the PC was powered off.
When I next powered up the system, there was no video signal at any time. The investigation I did made me think either the GPU was faulty or there was a PSU problem - all other aspects of the system could be shown to work. I returned the GTX580 as it was under warranty and purchased the GTX670 with the refund. This exhibited the same symptoms as the 580 - no video signal no matter how long I left the system running. I was able to test the 670 in another system and it worked there. I couldn't run this test with the 680 as the PSU did not have an 8-pin PCI-E connector - just 2 6-pin connectors.
I then added an NVidia Quadro card alongside the 670 and booted the system with this as the display GPU. This gave me a video signal at all times and more importantly allowed me to get into Windows and check if it recognised the 670 in Device manager. It did but reported a problem as, until now, I hadn't been able to load the 670 driver. I did this and rebooted - again no video signal during post and initial Windows boot but I did get video as soon as the newly installed driver was loaded. This is the state I'm in now other than I've flashed the vbios as suggested and the GPU no longer works on my other PC.
Note, I can happily remove the Quadro and boot the system with just the 670, except I don't get any video signal until Windows has loaded the 670 driver - the monitor light stays stubbornly orange till that point. After that, everything seems to be fine - I don't get the reboots that this problem started with. The only other clue I have is with my original spec I always had a problem from shortly after building it where I would need to power cycle the system most times as I could not wake it from hibernate mode.
I'm hoping this helps as I know I have run out of ideas of things to do. The only thing I have left to try is update the motherboard BIOS.
George

No video signal, but G5 works

Hi, newby here...
I've just received a G5 as a gift, without HD, but that's minor... I've placed one and was trying to instll 10.5. But the problem is that it sends no video signal to the monitor (an apple perfectly working one). Actually it sents (on the 30-40 startup tries) video signal 1 time: after again no signal. I've resetted eveything in every way (PRAM, NVRAM, PMU, SMU whatever, no signal). I can't believe it's the video card, because it worked one time. I've completely disassembled, cleaned and reassembled the new toy, but it shows no life sign to the monitor, but i can hear it works....
Can it be the battery?
What can I try? thanks all....

>GTX-680s in SLI
SLI is not supported, and may/will cause problems in PPro
Dual Card SLI http://forums.adobe.com/thread/872941
-problem http://forums.adobe.com/thread/872103

No video signal and wierd noises

I put together a new system with the 865pe neo 2 about a week and a half ago. Had to clear the CMOS to get a boot initially but since then the system has worked fine (except for an ongoing problem with com1..).
Last night I loaded UT2003 demo and played it for about 45 minutes then I powered down. This morning I started to get alerts from core centre that the 3.3v was down around 2.9-2.84. Then my video signal started cutting out (screen goes blank for a second) then finally the system froze. I rebooted and checked the bios (I'm using standard boot with no overclocking) As the day went on the system became more and more difficult to boot. At first I could get to the OS but it would quickly freeze. Then I could get into the BIOS but then the screen pixelated and then froze. On occasion the system would show 4 red lights and give me the 2 tone alarm. (Good God I hope its not the CPU) At this time I have no video signal at all. I tried another monitor..no go. I am using a good power supply (Enermax 365P-ve). Now the system POSTs okay but refuses to go any further (still no video though)
Do you think my ATI is toast? How could it just stop working? Does the loss of video card have such an effect on the boot up?
Any thoughts would be appreciated. I am at my wits end.
prouja

No I haven't tried a different power supply. All my other computers are PIII and use ~300W supplies.
I did try the ATI video card in an old computer and it didn't give my any problems so now I am thinking maybe the RAM or as you said the power supply.
Is there any way to test the output of the power supply? I have a digital multitester but I'm not great with it.
Could RAM issues cause the problems I encountered?
As an update the computer now makes 2 long and then 8 short beeps at startup and then hangs at keyboard initialization (as shown by the 4 leds at the back) Of course this started after I tried clearing the CMOS (power off).

K9N Platinum, 7600GTOC, SLI, No Video Signal

Just built up my new system, specs as follows
MSI K9N Platinum
AMD 5200X2 AM2 CPU
2 Gigs Corsair XMS2 DDR800
2 BFG Tech 7600GT OC's in SLI
Thermaltake TR2-500 Watt PSU +12V(1) 14A +12V(2)15A
1 Maxtor 120 GB SATA 150
1 Maxtor 160 GB SATA 160
When i turned the computer on for the first time, the system boots up and there is one small beep, sounds like it is posting, but I get no video signal from my monitor, which I checked on my other computer and is working fine, I tried both video cards in the 1st slot, in non-sli mode and I get the same result each time, so I get no video signal with all ways tried? Do I not have enough power in this PSU to run what I have? The video manufacturer suggests a 450W PSU, which I meet, but do I not have enough juice the 12V rails? And would this cause the no signal? Any help would be much appreciated.

Hello, welcome to forum.
"When i turned the computer on for the first time, the system boots up and there is one small beep, sounds like it is posting, but I get no video signal from my monitor, which I checked on my other computer and is working fine, I tried both video cards in the 1st slot, in non-sli mode and I get the same result each time, so I get no video signal with all ways tried?"
have you tried with one of them only into 1st PCI-E? use 1st DVI output, when using SLI, ensure SLI bridge is configured property, connect monitor to VGA onto 1st PCI-E slot. also check monitor output is configured property(etc: Input 1, Input 2).
power down PC, remove power cord from the PSU and Clear CMOS Guide
re-test.
ensure all power cables are connected property. try to boot with one memory stick only into slot close to CPU socket.
what D-bracket shows?
"Do I not have enough power in this PSU to run what I have? The video manufacturer suggests a 450W PSU, which I meet, but do I not have enough juice the 12V rails? And would this cause the no signal?"
yes, think is too weak for your system
its recommended to get single rail with high amperes on +12V (over 30A)
read here:
PSU's---2 x 12v---The Dual Rail Myth
Is your problem caused by your PSU?
good suggestion can be found here:
https://forum-en.msi.com/index.php?topic=105635.msg783148#msg783148
https://forum-en.msi.com/index.php?topic=103299.msg757739#msg757739

Solutions for displaying s-video signal on Macbook Pro? (2006 model)

I looking around for ways to display an s-video signal on my Macbook Pro, but i've no idea the best way to this.
I'm not really after capturing or recording the signal, but I just need a means that I can view the signal, and to be able to switch to another program running on the Macbook. (switch back and forth from Mac app to viewing s-video signal)
Ive seen a few products but they look overblown for what I really need to do like the Elgato video capture, and the xlr8 provideo usb devices.
Is there a way that I could use the DVI socket on the Macbook? I have seem its possible to display the Macbook signal on an external display using this socket, but can it be used to take an input signal?
Message was edited by: jauqq
Technical note of what I exactly need this for: I have an old Roland sampler which can be used with an external monitor to aid in its editing. The outputs on the sampler are s-video and digital RGB. So that I dont have to buy an old bulky monitor I want to use my Macbook display for this while I also am running Logic Pro 8 at the same time. And to switch from Logic, to the displayed signal from the sampler.

The DVI out on your MacBookPro cannot be used for input. In order to see the s-video signal on your MBP display you will need an analog-digital converter like the Canopus ADVC-55, plus you will need to run software. You may be able to use iChat A/V, although I haven't tried it for this purpose. It will cost you more than the Elgato eyeTV device, however.
You will find it much easier & cheaper if you just get an inexpensive LCD display to use with your Roland sampler.

No video signal on projector (Lion, MacBook Pro)

Hi guys
since I've update to Lion (10.7.2), I have problems getting a video signal via mini-DVI / VGA to certain projectors. I'm using a Mac Book Pro (end of 2008). I have never encountered similar problem with previous versions of Mac OS X. Restarting the MacBook or the projector doesn't help. Does anybody have an idea what to do?
Thanx
fweth

I also update to Lion from 10.6.8.. My Dell 3300MP projector worked fine with Snow Leopard. Then with Lion, there is occassionally scrambled signal, but most of the time no signal.. Tried restarting projector, restarting computer, turning mirroring off and then on, but no help. I am running an early 2011 13" MBP.. Really frustrating for someone who does lots of presentations and teaching.

How can I get my 2010 mac book pro to send signal out through the mini display port? end signal out through the end video signal out through the

How can I get my 2010 macbook pro to send signal out through the mini display port?

First, what you said is contradictory. You say "can't get a video signal", then say"the Mac wallpaper is broadcast, the mouse pointer is visible". "No video signal" means an absolutely black,blank screen. It sounds like you have plenty of signal.
I am supposing what you are seeing is actually a blank desktop, which is to be expected if your settings are such that you are extending the desktop, instead of mirroring it.
Within the preference panes is a setting that allows you to change this. Open System Preferences, click Displays, and then click Arrangement. You will see that you are extending the desktop. Change that setting.

How do I get a video signal to an external monitor via the mini-display port on my Mac Book Air?

I can't get a video signal out through my mini-display port on my Mac Book Air (version 1). Thus I can't feed BBC iPlayer to an external monitor. There is some connectivity - the MAC wallpaper is broadcast, the mouse pointer is visible and sound is transferred. Is it likely to be a cable connection problem (though the cable works with a Windows operating laptop)?

First, what you said is contradictory. You say "can't get a video signal", then say"the Mac wallpaper is broadcast, the mouse pointer is visible". "No video signal" means an absolutely black,blank screen. It sounds like you have plenty of signal.
I am supposing what you are seeing is actually a blank desktop, which is to be expected if your settings are such that you are extending the desktop, instead of mirroring it.
Within the preference panes is a setting that allows you to change this. Open System Preferences, click Displays, and then click Arrangement. You will see that you are extending the desktop. Change that setting.

Video signaling problem caused by 1.9, 2.0 BIOS (pointing out a BIOS problem)

Hi, i have a problem with the video signal. At random times when i boot up my computer, the computer would power up but there is no signal to the monitor. there is no hdd activity (via the hdd led) and nothing seems to be happening just that the fans are whirring. i have to unplug the computer then plug it again then turn it up again which sometimes repeats the problem. This is very irritating! So i did a little bit of troubleshooting:
1. I changed video cards. I used a SAPPHIRE ati radeon 9600XT fireblade and a LEADTEK GF4 ti4200. Both cards were causing the same problem and when i used both cards to another computer, there is no problem. = NOT A video card problem
2. used differnt kinds of drivers Cat 3.10, 4.10, 4.20 (omega and official) does not seem to do anything (which also i believe the drivers are OS dependent and its the bios of the vid card that starts up the vid card)
3. upgraded from 1.9 to 2.0 BIOS. still the same problem
4. reverted from 2.0 to 1.7 BIOS. the problem ended.
BTW, the board is 865PE-Neo2 - S. on a Intel 2.6Ghz C, 512MB TwinMos ram with m-tec chips, 80gb hdd, enermax 300w psu
so ive' solved the problem, and i just wanted to point out that there is a problem with 1.9, 2.0 BIOS. (havnt tried the 1.8 tho)

Wish I had seen this thread 2 weeks ago, but you did save me from buying a new graphics card. That was the last step (before chucking this mobo completely) in my attempts to fix the same problem. It didn't bother me too much, except I also couldn't get any DVD player (tried 3) to work. Would boot sometimes and at others gave a blue screen video error.
Flashing to bios 1.7 was the only thing that fixed it. Tried different memory, updating software, various combinations of drives, etc. For the record I tried bios 1.8, 1.9, 2.0, and 2.1. Not sure what about those updates causes problems but there definitely is something wrong.
Thanks.

HP w2207 Monitor - "No Video Signal" After Power Outage

My mother has a Mac Mini - 2009 model - that I bought her. It is connected to an HP w2207 monitor I used to have with a mini-display port to DVI [I think, either that or VGA] adaptor. She lives 2 1/2 hours away.
Last week there was a power outage and ever since she cannot get her system to work. Her monitor says "No Video Signal" and then goes to sleep.
I worked with her for over an hour on the phone trying to fix this problem (oh what fun). Tried every combination of things I know to fix it. It seems from her description that the Mac Mini is not actually booting. When I have her turn the computer off by (press the power button, wait, press it again), she reports that she will here the disk drive spin up for 10 seconds but then no more activity. The green light is on, but that is it.
I had her reset the SCM, but that didn't work.
Any help would be greatly appreciated.
Bryan

See if the Mini will boot from the install disk. If it does, have your mom use Disk Utility to repair her internal hard drive. Repeat running repair until Disk Utility gives the disk a clean bill of health. Then repair permissions.
Disk Warrior can sometimes repair things Disk Utility can't. However, it's possible the internal directory is beyond help. In that case, erasing the internal disk and reinstalling the system will be necessary. It's also possible that the disk itself or electronic components in the Mini have been damaged which would require repair at the Mac hospital.
You might want to consider buying your mom a UPC.

Video signal lost on launch of iTunes (after "update")

I just (foolishly) "updated" to the most recent version of itunes. And, surprise surprise, a headache has ensued. I am using a mac mini hooked into a TV via HDMI (the setup is mac mini ---> receiver ---> TV). After the itunes update, Weirdly, when I launch itunes, the video signal gets lost. The application appears to start without any problems at first, but 10-20 seconds after launching, my TV goes black. I've never encountered a problem like this before (I've had my mini hooked to my TV in this setup for some time.) Any thoughts on how to try to address this issue would be greatly appreciated. (If only I had this computer on time machine, I would go back an hour and all my problems would be solved.)

I had the same problem after installing Snow Leopard.
But now it seems magically fixed after updating to 10.6.2

Connection MACBOOK PRO to Philips LCD: NO VIDEO SIGNAL

Hello all,
I recently both a Philips LED TV, type: 40PFL8605H/12.
I have a MACBOOK PRO from 2007.
I would like to use this MACBOOK PRO as a media server on the TV.
I have connected the MACBOOKPRO via DVI-VGA connector to the VGA input of the Philips TV.
Result; I get 'no video signal'-message on the TV screen. I recently connected the MACBOOK to a beamer and it worked perfectly.
Although, the TV say's 'no video signal' the display system preferences does recognizes the TV. It say's PHILIPS FTV and a different number of resolutions.
I have tried them all, the result stays the same.
I'll tried the Philips helpdesk and the answer was that everything seamed to be connected ok...so, no use full help there (yet)
'Google-ing' around did not give an answer either.
Anybody here with use full tips?

Thanks a brody,
I'll get me one of those cables and give it a try...
are you sure it should work then? i see a lot of discussions and people with the same problems...
I was first thinking to buy a new mac mini to use it as my 'home-server' and as multi media player.
However, my 'old' macbookpro is also getting 'ware-out' and is subjet for replacement for profesional purposes...
If I could use my good old macbookpro as media/server, it would save me a couple of euro's...
Can you (or somebody else) advice me... my old macbook as media server and a new one as profesional lap-top or upgrade my old macbook (new harddisk extra memory) and mac mini as home server and media player...
of course, first criteria is to get my old macbook hooked-up to my TV ...
thanks for the advice...
cheers
p

No video signal on startup

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