No video on boot

Hi all,
I have just got a 2004 power mac g5 off my parents to see if i can fix. The Mac has been sat unplugged for a year or so, and when you come to switch it on you hear it start up and the fans come on, but there is no video. I looked on the support section and it suggested resetting the PRAM but unfortunately I don't have a Mac keyboard for it so i'm guessing i can't do this. Any help on how to diagnose/fix this would be greatly received.
Thanks

Chubbyfingers wrote:
Hi all,
I have just got a 2004 power mac g5 off my parents to see if i can fix. *The Mac has been sat unplugged for a year or so,* and when you come to switch it on you hear it start up and the fans come on, but there is no video. I looked on the support section and it suggested resetting the PRAM but unfortunately I don't have a Mac keyboard for it so i'm guessing i can't do this. Any help on how to diagnose/fix this would be greatly received.
Thanks
Step number one: replace the PRAM battery. Parameter RAM contains important display information and a weak battery can allow corrupted data to be read. The fact that the machine has been unplugged for a year yields a near 100 percent probability that the PRAM battery is a goner.

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KT3 dual video no boot

For no good reason I spent some time this morning trying to get a second monitor working on my main development system. I have a perfectly good Matrox Millenium PCI card, with the VGA disabled, that ought to work fine as the secondary display in a system with an AGP primary display. But, in fact, as soon as I put in the secondary card, the boot sequence hangs right after displaying the list of devices in the box. This is before Win2K even gets started, so it's got to be a hardware issue of some sort. I had thought maybe it depended on whether the card was on the primary or secondary PCI bus, but I tried both, and messed around with BIOS settings, to no avail.
Note that this isn't the "no video, just beeps" issue - the primary (AGP) card does initialize and show the boot sequence output, it just goes off into never-never land.
Some system specifics:
Windows 2000 Advanced Server SP3 (not that I think the OS is involved)
Motherboard KT3 Ultra2 MS-6380
AMIBIOS
MB BIOS Version:   5.50
Total Physical Memory:   1536 MB
[CPU]
Name:         AMD Athlon(tm) XP 2100+
Current Clock Speed:   1733 MHz
[Video Controller]
Name:         NVIDIA GeForce2 MX 100/200
Current Refresh Rate:   75 Hz
Installed Drivers:   nv4_disp.dll
Driver Version:      6.13.10.3082
Inf File name:      oem14.inf
Any ideas? I'd love to get this configuration running...otherwise I guess my next step is to yank the AGP video and put in two PCI cards instead.

Hello @SVJeff,
I understand that your Slimline computers do not display any video or boot properly when installing new RAM, and I would be happy to assist you in this matter!
To further diagnose the issue with both computers, I recommend following the steps in this resource on Resolving Startup Problems (Windows XP, Me, and 98).
If the issue persists, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

IBook G4: no video on boot... not the typical iBook issue

Hi,
I just received an iBook G4 1.2Ghz that is broken. It powers on just fine, but no video comes up. I removed the 512MB stick it came with to see if that was the problem, to no avail. Then I connected the iBook to an external monitor, with no video on boot as well. But other than the lack of video, the iBook seems fine. No loud fans (widespread issue on the G4s) or noises from a dying HDD, etc. I can hear the hard drive spin up, but it doesn't sound like it's loading anything, so my guess is that it's actually not booting.
But it gets even stranger. I can't even shut the laptop down by holding the power button (last resort type thing). I held it for a solid 20 seconds before I gave up and removed the battery. To me, it seems like this is a logic board problem, but I could be wrong. Anyone have any insight into this? I had an iBook that had video problems based on a weak GPU connection to the logic board, but this is different.
Thanks,
-Trevor

You wouldn't happen to know if Apple still has their iBook G4 repair program going, do you? By the looks of the support website it doesn't look like it, but I thought I'd ask.
In a bit of curiosity, I decided to try the "C-clamp" fix for the iBook. Amazingly, my iBook booted properly only to have it lock up again and see the screen change to colored vertical lines after 20 seconds. Like I said in my last post, I had another iBook that had a graphics chip problem and sometimes experienced similar issues. So now I think my iBook has more than one of the common iBook G4 logic board problems. The black screen/fans one is described here:
http://coreyarnold.org/ibook/
I tried to shim that specific chip as stated per the instructions, but it didn't work. I also did the same thing to this iBook, that fixed my older G4... shim the graphics chip. But, unfortunately, I still don't have a working iBook as of now, despite the shim. I thought I made progress when I started getting the fan on every boot (there was no noise +at all+ before), but that has since gone away and I'm back where I started. I'll keep trying different things to fix the iBook, but it think a logic board replacement is going to happen sometime in the near future. Anyone know where to find them besides eBay?
Thanks,
-Trevor

G5 Black & white video when booted from install DVD

It has been years since I installed 10.5 on our G5 so I can not remember if this happened back then but think it did.
When I boot from an install DVD (both the original G5 DVD with Tiger and the MacOS Leopard DVD) the video output drops to 1-bit (dithered black & white) which makes it very hard to discern the text on the shaded buttons in the GUI. The video card is fine - when I hold down the Option key on boot to select the DVD the video is full-color, but as soon as it switches to running from the DVD the video becomes low-rez dithered b&w.
Anyone else see this issue and suggestions on resolving it? The display is a Dell 17" wide model. I don't have another display that is easily swappable to see if it's a problem with it or the Apple DVI-to-VGA adapter.
The G5 tower is a first-generation 2x2 (2CPUs, 2GHz) with 2 DVI ports on the video card (can't recall which card I ordered back then).

Great to hear, thanks for the report!
I suspect what happened, was that the Install also changed some PRAM or NVRAM setting, those are where number of colors are held.
Some earlier Macs store these settings in PRAM:
Status of AppleTalk
Serial Port Configuration and Port definition
Alarm clock setting
Application font
Serial printer location
Autokey rate
Autokey delay
Speaker volume
Attention (beep) sound
Double-click time
Caret blink time (insertion point rate)
Mouse scaling (mouse speed)
Startup disk
Menu blink count
Monitor depth
32-bit addressing
Virtual memory
RAM disk
Disk cache
http://support.apple.com/kb/ht1379

Chimes, no video, no boot when video card installed. Cause?

Dual G5 2.0 (late '04?)
Used for 5 years, then system started suddenly powering off. Eventually wouldn't boot. Tried swapping out ATI X800XT vid card for a 9600 (both AGP) & it worked again for a couple days, then wouldn't boot again. Put it aside for a while, came back to it yesterday, and came to these conclusions:
1) with X800XT installed, the system (PSU) clicks once, then nothing. no chime, no lights, no fans.
2) with 9600 installed, it chimes, power light on & steady, fans start, I hear the HDD click once, then nothing. no video out. eventually the fans go into overdrive.
3) WITHOUT a video card, it chimes, light on, fans OK, and I hear the HDD running through what I assume to be a boot sequence.
4) I have reset the PMU and replaced the battery. Also tried CMD-CNTL-O-F. Nothing.
Thinking it might be the power supply? Where do I go from here to diagnose the cause?
If it's the logic board, I'll tear out the guts & sell on ebay. If it's the PSU, I've read about someone replacing it with a standard PC ATX supply (don't want to spend the $$ for a G5 PSU.)
Thanks for any suggestions!

OK, assuming you have file sharing enabled, when you bring the machine up without video card, can you connect to it from another computer on the same LAN?
The fact that either video card blocks the boot is suggestive of maybe a power supply problem, though in my experience an overload condition perceived by the power supply will result in a click from the supply and the machine powering down completely.
That was a situation I had some time ago before replacing the supply. What would happen was that in a non-safe boot, when the kexts for the Ultra6800 loaded, the current draw would increase and the supply would trip itself off. (Puzzling mystery solution revealed just now in formulating the reply. Thanks.)
That being said, the fact that safe boot doesn't help plus the other differential symptoms between the cards really does suggest a failing power supply. A new supply around the web is on the order of $200, but there are plenty of used ones on eBay for much less, occasionally even a new one goes at a bargain.
One thing you could do is blow the probably well-stocked dust supply out of the power supply. Better to remove and do that outside, but you can make something of a dent with the power supply in the enclosure. Just be sure to do it outside, because the dust that can come out will probably be pretty nasty. (Of this I have personal experience!) Of course, under what you have reported, this has a slim chance of actually helping.

Half a chime (cuts off), no video, no boot

My G5 just crashed launching a Protools session. It will no longer boot. It chimes - but the chime sound is cut off half way. The fans power up and I can hear the drives spin up. I've removed PCI cards, swapped drives, swapped RAM... nothing helps. No video, no response from the keyboard (trying a PRAM reset for example).
Did I just loose a logic board? Any suggestions would be much appreciated.

more info:
It just booted after letting it sit for almost an hour.
Passed Techtool hardware tests. I just started another loop....
Crash!
Just shut down with no display or fans - light still on though.
Something overheating here? I'm hoping someone has an opinion as to logic board or CPU failure - or something else (temp sensor?).
Any help or comments would be very much appreciated.
What the...
I hit the power button (expecting it to either shut off or make me hold it for 10 sec ts shut down) and it acted like it woke from sleep and continued with the Techtool test where it left off.
Then it shut down again after 15 sec or so.
Repeat... same.
Opinions please!

HT3964 No video, no boot chime. Just a fan sound

Tried resetting my Macbook Air SMC (resetting Intel Mac System Management Controller). No luck. I stil hear a fan but no video (either laptop or extermal) and no boot chimes. Thoughts?
Ron

I should hav posted my favorite recommendation, what was I thinking:
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

Sometimes no sound in flash videos after boot?

Sometimes after I boot up the machine, I get no sound in flash videos. First I didn't know why it was happening, but as I read a few articles here on forum, I found out it was because of my USB webcam (logitech) - alsa was messing something up and didn't know how to handle sound drivers well (so they say). So one of the suggestions I found was to force the (in my case) snd_hda_intel module load before snd_usb_audio module during the boot process. I thought it worked, but after a while the same problem appeared again. If I just unplug the webcam from my computer, sound works perfectly on each boot, but I don't want to get down and insart the cam everytime I need it... Anyone have any suggestions what I should try to fix this? If I need to provide more information - please tell, and I'll provide it, just say which and how.
thanks

Oh God, this again.
Alright you're a newbie, but there is a SEARCH button. Read these, and then post something useful:
http://bbs.archlinux.org/viewtopic.php?id=91908
http://bbs.archlinux.org/viewtopic.php?id=89445
http://bbs.archlinux.org/viewtopic.php?id=62266

MAcbook Air 11" - No video on boot & Fans go nuts

I have read a fair bit about this, but nothing is fixing this intermittent issue.
I turn it on, screen stays black then the fan kicks in at top speed.
Shutting down just ends the fan but restart does nothing.
Have tried PRAM etc, have the latest versions of all firmware and updates.
Sometimes it does come on, but mostly, it doesnt. Off to Apple store obviously, but is this common, if I can fix it myself I would rather not get down to the Apple Store.
Many thanks for any help.
Rob
No video, fans go nuts basically. I dont know if there is anything behind the black screen.

Hi,
Try to reset the SMC first before going to Apple store (connect the power adapter to the computer, then press once left side shift - control - option and power button, this should reset the smc).
If after PRAM reset there was no boot chime, this could mean that the computer cant start up, try with SMC, then I guess you will have to go to Apple Store for repairs, could be RAM problems.

MSI K9N NEO no video upon boot

Hi
the problem started one week ago. i shut down the computer for the night and the next day it didnt want to boot. the fans start but there is no video feed. When i push start all fans except on the vga starts and the lights on the onboard lan card flashes. the vga fan start about 7 seconds later and goes on max(sounds like hell). Ive tried everything i can think of.
here is my rig
PSU: AXP 630 watts
3.3V 5V 12V1 12V2 -12V 5VSB
24A 32A 21A 22A 0.6A 2.0A
CPU: AMD Athlon 64 X2 6400+
RAM: 2x1gb corsair xms2 800Mhz 2x512Mb Corsair valueselect 667Mhz
VGA: GeForce 8800GTS 320Mb Gddr3
2 standard hdds
Soundblaster audigy se
It cant be the GPU because it worked on another computer.
It shouldnt be the PSU because i had a 420watt psu before and it worked fine, but now i have a 620 watt psu.
it shouldnt be the memorys because the worked before and ive tried every combination possible on the ram slots, whats the odds for every memory stick failing at the same time.
that leaves the cpu and the mobo.
i cant test the cpu because i have no acccess to a computer with an am2 socket.
Ive tried building it outside the chassi, ive tried booting with only basic components and without the basic components too, no beeping no nothing.(and yes i have the annoying beepspeaker on the right place.) I have run out of ideas, do you have any?
tomorow im gonna call customer support.

Your board does not support 125w cpus like the 6400+ used! Therefor your board most likely got killed due to the overstress by the too much power consuming cpu. This board is meant for 89w cpus maximum and that means 6000+ EE, even ordinary 90nm 6000+ is not compatible.
See cpu support chart for reference: http://global.msi.com.tw/index.php?func=prodcpu2&prod_no=1585&maincat_no=1#menu
As for using an unsupported cpu you probably also voided warranty so you better don't tell customer service. I strongly recommend to get a new board and to avoid further tries with this combination of board and cpu.

MSI N660Ti PE 2GD5/OC no video on boot-up until multiple tries

Hi, I'm really glad I found this forum, it seems like a lot of people are able to get help
S/N: 602-V284-09SB1208041275
Uploaded ROM of my VBIOS: htxp://speedy.sh/Wd6P6/GK104.rom
On bootup, the monitor does not detect any video signal (however the keyboard does respond). I have to do a hard shut down (hold power button) and then power up again until I get a video signal. This takes 2-4 tries.
After the video signal is sent successfully, I am able to use my computer with no problems (gaming, running stress tests, FurMark, passes diagnostics, etc.). I can even restart it. It's just that if I shut down, the next time I boot up I won't get a video signal. So as a workaround, I leave my computer on.
I tried:
1. Using HDMI instead of DVI.
2. Different monitor.
3. Different PSU cables.
4. Installing the newest version of motherboard BIOS and NVIDIA drivers.
5. On-board graphics worked fine.
6. Rosewill said it could be my PSU, so they RMA'd it.
7. Different video card from my friend, PNY GTX 275 896MB, worked fine.
8. My friend put my video card in his tower and it didn't send the video signal once. But, he powered off and every time he's tried since then it's worked fine...? (only difference he can think of is his motherboard only support PCI Express 2)
I appreciate any help! I'll be really happy to finally figure out what's causing this problem.

Quote from: Svet on 16-June-13, 02:58:18
go for dos version then
Nothing seems to happen when I try nvflash from DOS. I just get a blinking cursor after I enter the nvflash -4 -5 -6 201.ROM command.
I created a bootable USB drive and copied over the nvflash DOS files (nvflash.exe and cwsdpmi.exe) and the 201.rom. I boot into the USB and get the DOS prompt. I typed dir to verify the files where there. Then I typed nvflash.exe -4 -5 -6 201.rom and hit Enter. A blinking cursor appears on the next line. After 5 minutes, I hit the Pause Break key on my keyboard... nothing. I hit Ctrl+c... nothing. So I ended up restarting by pressing ctrl+alt+del, and I could boot to Windows fine.
I tried booting to USB and using the command various ways and it's always the cursor: nvflash -4 -5 -6 201.rom (just nvflash instead of nvflash.exe), nvflash -5 -6 201.rom (because it looks like -4 isn't a command any more), creating and running a .bat file that contained nvflash.exe -4 -5 -6 201.rom.
In fact, it doesn't seem like nvflash works at all. I also get the blinking cursor if I type nvflash -a or nvflash ?

KT3 and Video Card Boot Probs

OK So I build my KT3 System with an Athalon XP 1800. First boot the thing comes up fine, Power down, Second boot, RAM beep error, 3 long beeps (RAM bad or missing) Since I had just bought the system I got the RAM replaced, yet the problem persists. I finally narrowed it down to this: when I first boot the system with the video card plugged in it boots fine, even a soft boot is fine, goes all the way to Windows, however if I cold boot it I get the RAM beep errors. Here's the weird thing, if I disconnect the Video card from the MoBo and reseat it then boot again the system boots fine until the next cold boot. ?( ?( ?( ?(
ANY help would be appreciated. I tried both a TNT2 Ultra (Xentor32) and an nVidia Geforce 256. I have yet to try my GeForce 2 MX but I am afraid I will have the same result.
I've tried disabling the quick boot feature, the ACPI, and also made the FSB changes, but I don't know why I am getting bad RAM beep code if the Video card is the culprit. Help me out please

i had the same issue with a kt3 mobo and a gf3 ti 200 and athlon 1800.
i changed psu and vid card and ram plus made sure the sb live wasnt in pci slots 1 or 5 and after that in desperation ichanged mobos, same issue dont know why tried every fix i could find what i had to do was cold boot let it hang then switch it off on the back and then reboot it would then boot never did fix the issue and the store that sold me the parts tried every combination to fix it just incase id screwed up after 3 days they changed the mobo to a gigabyte and it works dont ask me why i bought this mobo because several friends use it and have never had any issues.
BTW i tried a gf2 mx a tnt a gf3 ti200 a gf4 mx and lastly a gf4 ti 4200
three brands of ram
a 200 watt codegon POS psu a generic 350 a antec 400 or so and finaly a topower 350 nothing seemed to help

New Build Drops Video on Boot Up

The system has the following configuration.
MSI 890FXA-GD70 AM3+ AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
AMD FX-6100 Zambezi 3.3GHz Socket AM3+ 95W Six-Core Desktop Processor FD6100WMGUSBX
ASUS EN8400GS SILENT/DI/1GD2(LP) GeForce 8400 GS 1GB 64-bit DDR2 PCI Express 2.0 x16 HDCP Ready Low Profile Ready Video Card
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C
Western Digital Caviar Blue WD5000AAKX 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
When the system boots from the win7 CDROM and runs the install everything apears to be working fine. Install completes loading files to hard drive without a hitch.
On boot of the windows installation from the hard disk it apears like it is going to start. I get the 4 windows flying in ... then nothing.
Aslo the diagnostic led on the main board goes dark. The board has power and blue leds are on all over the board. The system will not shut off and I need to recycle the power supply to get it to boot again.
I reinstalled windows again and the same thing happens at the same time. I can complete the first stage of the install, but the system stops (as described above) on startup from the hard drive.
What should I check? Is it abnormal for the diagnostic led to go dark when there is still power to the board?
Thank you for your help... I built this system as a gift for my son and I really am anxious to figure aout what could be going wrong.

Alright, let's have a look at the BIOS first:
Quote
V 1.13B2 11011
This is a BETA BIOS Release, which as such is no problem. However, there have been a number of newer releases after that, including the latest final BIOS Version which is newer than the release you are currently using. Here is the full changelog:
A7640AMS.1D2 [v1.13b2] ---> A7640AMS.1D0 [v1.13(0) Final]
- Fix When running 3Dmark11, the performance of the new bios is lower than the old bios (around 300points difference).
- Support patch CPU VID function.
- Limit default CPU VID to 1.2125V when use AM3+ CPU.
- Adjust CPU voltage and CPU PLL voltage to fix FX-6100 CPU BSOD issue when enter OS.
- Update to AMD AGESA Orochi 1.1.0.2 and AMI 8.00.16_CPU-OrochiPI_1.1.0.2-1.
- Added Cpu Core Control by Core for AM3+ CPU,and added Adjust Turbo Core Ratio(Pb1) for AM3+ CPU.
- FIX when set "Extra RAID/IDE Controller" to disabled,the Jmicron POST ROM can show up and it can still enter os.
- Fixed DRAM GG34GB1333C9DC_2GB auto voltage at 1.35v.
As you can see, there have been further fixes and adjustions that have to do with your CPU model and also some microcode/module updates. I would recommend a BIOS Update to the latest final version (do it under DOS). Then properly clear CMOS again, load "Optimized Defaults" in BIOS Setup and re-test.
Secondly, your PSU:
Your PSU (in addition to the fact that the review I linked you to is not really happy with the performance), has a split 12V circuit. Each 12V-Sub-Rail can deliver up to 16A@12V [=192W] according to Cooler Master's own specifications. If the review is correct, then the PSU is not able to deliver the amount of power that it is advertising. So, to be on the safe side, we should work with 14-15A maximum output on the 12V sub-rails.
Since your video card does not have its own power connector, it will be powered by the same sub-rail your CPU is powered by:
--> CPU -> TDP = 95W .... 95W/12V ~ 8A
--> GPU -> max. power draw ~ 40W .... 40W/12V ~ 3,33A
This adds up to 11,33A@12V on a power rail that we don't want to be forced to deliver more than 14A. Count in an extra 1A for the board itself and a few more 12V pits and pieces drawn by hard drives, optical drives, LEDs and fans.
The bottom line is, that there is sufficiant indication that your PSU may be operating at its limit.
In case the BIOS update does not change things for you, you should consider testing a quality PSU that is able to deliver at least 20A on a single 12V rail or sub-rail.

One long beep and no video on boot

Just wondering if anyone could help me out with this little problem I seem to be having. I've checked all the connections to the board and everything is right. When I try to boot up all i get is one long high pitched 4 or so second beep that loops every 2 seconds and no video (using onboard video) or anything else.
Even tried using a small 4x video card to see if that was the problem.
System Specs:
MSi p4mam-l microatx mobo
VIA Vt8751a & VT8235 chipsets
p4 2.0ghz celeron processor @400fsb
Corsair ddr266 mem
award 430w power supply
wd 40gb ata100 hd

Pretty long beep but I finally figured it out and got it fixed. Stupid board was flaking out over the corsair mem for some reason. It took six different sticks of ram before i found one that the damn thing would boot up to.

Imac 20" Intel Chime that's repeat but NO video or boot up

Hi,
I have an Imac 20" intel and have the follwoing problem.
When I boot my system, what i will get is the chime sound but this wil loop forever but further nothing.
I removed the cover of it to check the Leds and the I get 3 leds.
When I remove the ram and boot up, then I don't hear nothing (no chime).
I've done some research but can't find any solution. And don't have any idea where to check first.
All help welcome and many thanks.

Hi,
For the one that are interested in what the solving is? This had to do that my CPU was Failing.
I would like this community to thank for they replaying!!!
I went to the apple store to inform me what they will say. They diag. my computer and they were telling me that my motherboard was failing.

No video on boot

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