Problem , Why does my Mac Pro 1,1 LED Light Flash on/off

I turned my Mac Pro 1,1 and all i get is all the normal noises but nothing on the Screen and the LED light at the front flashes on and off

Please HELP

Regards

Adam

This usually means some sort of ram issue.

If this computer was working properly before this. What was done to it recently that may have impacted things?

- Nick

p.s. Maybe it's the cold weather in your shed!

- Nick

I can only put it down to i bought memory and installed it from 2GB to 8GB

SimplyMac2013 said:

I can only put it down to i bought memory and installed it from 2GB to 8GB

Click to expand...

When did you do the upgrade (how long ago)?

- Nick

2 Hours ago i have removed the memory as the area was hot i have unplugged and put back the original memory but left the machine up plugged

SimplyMac2013 said:

2 Hours ago

Click to expand...

Yes...then that's the problem. Two possibilities:

1. Either some of the ram is bad (possible...but maybe a long shot).
2. The ram was installed incorrectly. With some/most Mac Pro models...the ram must be installed in specific manner/order. Certain slots must be filled first.

- Nick

SimplyMac2013 said:

...and put back the original memory but left the machine up plugged

Click to expand...

So when you reinstalled the original ram (in the eame exact ram slots) does the computer work ok?

- Nick

Good News after leaving and yes Nick put everything back as it should be all is working i did panic but glad to see Mac working again

Thanks Nick for advise

SimplyMac2013 said:

Good News after leaving and yes Nick put everything back as it should be all is working i did panic but glad to see Mac working again

Click to expand...

Are you saying everything is working fine with the old ram or the new ram?

- Nick

Old Ram has made the machine back to normal

SimplyMac2013 said:

Old Ram has made the machine back to normal

Click to expand...

Ok just wanted to be clear.

What ram upgrade did you purchase (how many sticks of ram...and what size)?

- Nick

The RAM on Mac Pros is very picky. What brand did you get and where?

Ok i bought from a Company on eBay maybe not the best option ....

I bought 8 x Hynix (HP P/N 398706-051) 1GB 2Rx8 PC2-5300F-555-11
This Link: 4GB (4x 1GB) DDR2 667MHz FB DIMM Memory for Apple Mac Pro ( 2006 - 2007 ) UK | eBay

Keep well away from eBay sellers for memory. OWC and Crucial the go and they are Mac specialists:-

Mac Pro Memory

Thanks HarryB Memory Noted

SimplyMac2013 said:

Ok i bought from a Company on eBay maybe not the best option ....

Click to expand...

I wanted to add regarding the e-Bay ram purchase. Since you purchased 8 x 1gig ram modules...and if all 8 were installed when you got the flashing light error...then the ram is either:

- not the correct type
- or one or more of the modules are bad

As mentioned already. Mac Pro's (especially the early ones) can be very picky when it comes to ram. And since they are so picky...getting ram from a reliable retailer is best (Crucial or OWC).

And as you probably know...ram for the early Mac Pro's is VERY expensive. Like 4x more expensive/gig compared to ram for later Mac Pro's (2009 and newer).

- Nick

p.s. I believe that Crucial has a UK based warehouse that they ship from. So shipping time & cost shouldn't be too terrible compared to other options.