PC no longer boots with 4 gig memory but does with 2 gig?

Mikoyan · 23 Apr 2008 at 22:08

Hey guys I just recently turned my pc off....what a mistake that was :mad:

I have an Asus P5B motherboard. When I switched it back on the fans would all go loud but not actually boot.

I went through the process of fault finding and found if I have 3 gig/4 gig it will switch on...no beeps but wont boot.

If i have 2 gig I can boot and am writing to you now...

What could possibly be wrong? I have checked memory its fine... has the motherboard gone?

Please help

smogsy · 23 Apr 2008 at 22:24

can u acess the bios?

i know vista has a issue with over 2gb if you have vista maybe you corrupted that 2gb patch if not have you tried each stick indivually to test all the ram?

Mikoyan · 23 Apr 2008 at 22:34

i just tried latest bios, booted with all slots in no post (no beeps or nothing)

back to 2 gig again

Greenlizard0 · 23 Apr 2008 at 23:11

I had a quick search but couldn't find the original thread but it was an issue which a gentle increase in the Northbridge voltage did the trick.

mick4545 · 24 Apr 2008 at 00:14

Are you pumping enough volts through the RAM? Maybe you have enough power for 2 gig but not 4. The default RAM voltage on my MB is 1.8. but my RAM is rated at 2.1

mame · 24 Apr 2008 at 01:18

try increasing the northbridge (mch) voltage slightly. My system fails to boot half the time without this and thats with a 2x2gig kit! My motherboard is a gigabyte ga-p35-ds3l. have used 2gig kits before

misterPK · 24 Apr 2008 at 09:02

mick4545 said:
Are you pumping enough volts through the RAM? Maybe you have enough power for 2 gig but not 4. The default RAM voltage on my MB is 1.8. but my RAM is rated at 2.1

^ What he said. You'll find over time power supplies slowly degrade, where as before it had just enough juice to get 4Gb working, its now just under the level required. Check what Voltage your RAM is rated for, and up the level in your BIOS whilst staying in the safe range specified. Its a common problem so don't worry.

PK!

Mikoyan · 24 Apr 2008 at 09:09

wow thanks for the input guys!

and here I am running memtest on each stick :/

I went into the northbridge controller what setting do I need to increase please? its been a long time since I delved into these things

Hope you can help

Ta :cool:

Mikoyan · 24 Apr 2008 at 20:57

an update guys this worked!

Last question is is dram voltage to 2.00 ok? I have team extreme memory thanks

helmutcheese · 24 Apr 2008 at 21:54

Yes 2.1v is normal on many kits.

St0rmer66 · 24 Apr 2008 at 21:59

Had mine at 2.1v for months. (4x 1GB sticks)

DavidB · 24 Apr 2008 at 22:25

Try the lowest voltage it runs at, if it wont run bump it up a notch. No point wasting lectricity for the hell of it now is there.