iMac A1418 continuous chime & no apple logo

[Catalinut]

Hi all

I'm new to this forum and I just want to see if anyone had this problem before and how did he fixed it?!

So, I have an iMac A1418, opened it to upgrade SSD to 1TB and after putting everything back in place I get a lit up screen, no apple logo and continuous chime...

I already tried the following:
1. PRAM reset - still not working
2. Battery change - still not working
3. Flex video cable change (because I noticed that when I unplug that and start the iMac, I get only one chime, but obviously no video) - still not working (picture attached with flex cable I changed)
4. All 4 green LED's on the board are on so it's not a graphics problem, ram problem...

I'm just about to throw it out the windows because it's driving me mad, so any suggestions are greatly appreciated!

Many thanks!

Catalin T.

 

[darkpaw]

Have you tried starting up the iMac to Internet Recovery? I take it the SSD has no macOS on it? You'll need to get macOS on there before the machine will do much. Not sure why you get a continuous tone, but see if you can get Internet Recovery working first.

 

[Catalinut]

Tried that and doesn't work...
Tried all the commands with R and P+R and not working.
Also on the new SSD I've installed OS High Sierra from another macBook air and tested it so the SSD is working but my system doesn't ;(

P.S. my system isn't working even with the old SSD on it... ;(

 

[Dave Braine]

Do you get any of these chimes?
https://support.apple.com/en-gb/HT202768

 

[Catalinut]

Do you get any of these chimes?
https://support.apple.com/en-gb/HT202768

Hi Dave,

None of these. It seems like it's stuck on the same chime like the first one when you power it up....

 

[darkpaw]

Tried that and doesn't work...
Tried all the commands with R and P+R and not working.
Also on the new SSD I've installed OS High Sierra from another macBook air and tested it so the SSD is working but my system doesn't ;(

P.S. my system isn't working even with the old SSD on it... ;(

Can you get a Genius appointment in an Apple Store? Or maybe locate an Apple Hardware Test disc and connect up an external DVD drive if your iMac lacks an optical drive?