System won't boot after video card replacement

Question

iMac Intel 24" EMC 2111

Model A1200 with 2.16 or 2.33 GHz Core 2 Duo processor

113 Fragen Alle anzeigen

Don H Kemp @donhkemp

Rep: 9

1

Veröffentlicht: 23. Feb 2011

Einstellungen

System won't boot after video card replacement

Replaced the GPU in my 24" iMac, following a number of web resources. No the machine won't boot. The pilot lamp (lower right corner) comes on, and at least one of the fans runs, but no screen backlight and (apparently) no HDD action. With the bezel removed, I have one green LED just above the memory slots, so I believe the Power Supply is OK. I've had the bloomin' thing open half a dozen times, looking for something I forgot to reconnect, but there don't appear to be any empty connectors. Any suggestions on what to do next?

Beantwortet! Antwort anzeigen Ich habe das gleiche Problem

Ist dies eine gute Frage?

Ja Nein

Bewertung -1

1 Kommentar

After reading through a bunch of questions & answers here, I tried the CMD+OPT+Q+R startup and, lo and behold, I got a chime, backlight, and the system looked like it was starting to boot. Went through the grey screen, to the blue one, then... blank again. Do these new symptoms point anywhere?

23. Feb 2011 von Don H Kemp

Einen Kommentar hinzufügen

1 Antwort

Gewählte Lösung

mayer @mayer

Rep: 685,3 Tsd.

MacHale Enterprises

3,4 Tsd.

1,1 Tsd.

2,6 Tsd.

Veröffentlicht: 23. Feb 2011

Einstellungen

Put the old chip back in.

War diese Antwort hilfreich?

Ja Nein

Bewertung 2

9 Kommentare:

Swapped the original GPU back in, and things are different. Not sure they're better, but different. The system starts now, get the chime, backlight, grey screen, blue screen and a few seconds of wallpaper, then back to a blue screen, with a spinner. Optical drive won't accept a DVD, and it seems like there's no OS to be found. Too late tonight to do more, so I'll sleep on it.

24. Feb 2011 von Don H Kemp

First zap the PRAM, start up holding down the option, command P & R keys, hold for three tones then proceed to start.

Your machine cannot find an operating system. Boot up from your system installation disk, insert the disk and start up holding down the "C" key, go to the second page pull down menu to Utilities -> Disk Utility and see if the drive can be repaired.

24. Feb 2011 von mayer

Zapped the PRAM, then tried to load the install disk. The optical drive still won't load the install DVD. Any way I can install the OS from my laptop DVD drive?

24. Feb 2011 von Don H Kemp

Yes in Target mode as long as the laptop has an Intel processor.

24. Feb 2011 von mayer

To boot in Target Mode connect the two macs via Firewire cable and start the sick mac holding down the "T" key. Then start the other mac normally. The sick macs hard drive icon should show up on the desktop. I'd run Disk Utilities first then start the new mac from your system installation disk holding down the"C" key and install a system on the other mac.

24. Feb 2011 von mayer

4 weitere Kommentare anzeigen

Einen Kommentar hinzufügen

After reading through a bunch of questions & answers here, I tried the CMD+OPT+Q+R startup and, lo and behold, I got a chime, backlight, and the system looked like it was starting to boot. Went through the grey screen, to the blue one, then... blank again. Do these new symptoms point anywhere? — Don H Kemp
Swapped the original GPU back in, and things are different. Not sure they're better, but different. The system starts now, get the chime, backlight, grey screen, blue screen and a few seconds of wallpaper, then back to a blue screen, with a spinner. Optical drive won't accept a DVD, and it seems like there's no OS to be found. Too late tonight to do more, so I'll sleep on it. — Don H Kemp
First zap the PRAM, start up holding down the option, command P & R keys, hold for three tones then proceed to start.

Your machine cannot find an operating system. Boot up from your system installation disk, insert the disk and start up holding down the "C" key, go to the second page pull down menu to Utilities -> Disk Utility and see if the drive can be repaired. — mayer
Zapped the PRAM, then tried to load the install disk. The optical drive still won't load the install DVD. Any way I can install the OS from my laptop DVD drive? — Don H Kemp
Yes in Target mode as long as the laptop has an Intel processor. — mayer
To boot in Target Mode connect the two macs via Firewire cable and start the sick mac holding down the "T" key. Then start the other mac normally. The sick macs hard drive icon should show up on the desktop. I'd run Disk Utilities first then start the new mac from your system installation disk holding down the"C" key and install a system on the other mac. — mayer

iMac Intel 24" EMC 2111

System won't boot after video card replacement

1 Antwort

Antwort hinzufügen