No Display after upgrading. Pc goes into power save mode.

kingwill

Commendable
Mar 9, 2016
7
0
1,520
I have upgraded a Alienware Aurora R2. The problem is that when changing the cpu it will not display on the screen, it sends the monitor into power save mode!! If I swop back to the original cpu it works fine.

The full story, the pc was a all stock R2 with a i3 530 cpu, 4gb ram over 3 slots and a redwood ati 5760 gpu.

I changed the cpu to a i5 760, the gpu to a gtx 690 and the replaced the ram with 8gb hyper fury x over 2 slots. All powered up but no display (goes into power save mode).

So I went back step by step and the unit would not except the ram at all, so that was first conclusion. So I preceded using the original ram but using only one 2gb stick, still no display. I finally got to the cpu and when I put the old cpu back in up came the display, all perfect working fine.

So as of now, I have the new GPU in working fine, the one stick of ram working fine and everything boots up fine with no problems. The moment I put the new cpu in though, it will not display anything (power save mode), put the old one back in works fine.

I thought this may be a power issue with the gtx 690 being a power hungry card. So I looked at other hardware to see if I could improve, so I removed the wireless pcie card, unplugged the 4 hard drives (that are standard with this unit) and used 2 low power ssd's. I then tested the unit with the new cpu and again no display swopped it back to the i3 and it works perfect.

So basically, everything works fine now with the gtx gpu and one stick of ram and 2 ssd's but the moment I swop cpu's it will not display the screen. Im lost.

I also tried resetting the bios and cmos and i have turned off the raid confog on boot up etc.

These units only come with a 525w or 875w psu and I cannot get in to tell which one is in there but even with the latter which I have based all my calculations on it should still work.

Not found an answer on this online yet but many similar problems.
 
Solution
Its really difficult on this rig without actually taking out the psu, which i wanted to aviod. At the present the gpu has the p15 and p17 both 8pin rails attached. I guess it is board line on the 525w with the 690. And i do belive it to be the 525w as everything was the lowest spec of range on this unit. Guess i will have to buy a psu and give it a try, i did want to keep as much as possible original but i guess thats just not fesable when upgrading from this old. When i do get a new psu i will update. Thanks for getting back to me anyway.

kingwill

Commendable
Mar 9, 2016
7
0
1,520


The alienware r2 only came with a 525 or 875w psu, the GTX 690 is a relatively low power comsuption card with nvidia recommending only a 650 psu and the card it self only maxs at 300w. It is very difficult with this model rig to determine exactly which stock psu they came with due to the way they are built. At the time dell could have probably got it of the serial number but it is too old now. So its not hard to work out the power consuption based on the latter. I don't think this is the problem.

Its not unbranded its stock buddy.

I have seen this problem before but never located afix.
 

kingwill

Commendable
Mar 9, 2016
7
0
1,520
To reitarate the rig works perfectly until you change the cpu !!! the difference in power between the i3 and i5 is about 20w

If this was the problem i would be seeing more problems by now when gaming on load for example which i do not.
 
To explain myself:

A 525W OEM PSU may deliver 450w at best on the 12V. Not something I'd be comfortable with given the whole rig will draw 400+ under gaming.

Second, assuming its the 875 model, then I'd say your issues could be to do with the OEM motherboard. Again, I don't know what they use.
 

kingwill

Commendable
Mar 9, 2016
7
0
1,520


The motherboard is an intel p55 (ibexpeak) and i did wonder if the cpu was compatable as it was much later chip that came out, but according to intel website the chip is compatible. I also though if the chip was faulty but i did buy it brand new factory sealed, so i would be surprised on that one. I am just stumped.
 
find out which PSU it is, and what the amperage is on the 12V rail. I Really think if it is the 525W and it is OEM, you might have power issues. And whilst the i3 and i5 are only 20W apart, the i5 may have a higher peak current draw at certain time,s overloading the PSU. Given the 690 is about 275 under gaming like the card I have now, and I have measured 400w from the PSU in gaming, I'd say you might be pushing it.
 

kingwill

Commendable
Mar 9, 2016
7
0
1,520
Its really difficult on this rig without actually taking out the psu, which i wanted to aviod. At the present the gpu has the p15 and p17 both 8pin rails attached. I guess it is board line on the 525w with the 690. And i do belive it to be the 525w as everything was the lowest spec of range on this unit. Guess i will have to buy a psu and give it a try, i did want to keep as much as possible original but i guess thats just not fesable when upgrading from this old. When i do get a new psu i will update. Thanks for getting back to me anyway.
 
Solution

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