For all you Computer Wizards out there -Help-new psu/wont boot - HotUKDeals
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For all you Computer Wizards out there -Help-new psu/wont boot

Adnan786 Avatar
banned6y, 1m agoPosted 6 years, 1 month ago
I would say that my computing skills are at an intermediate level but ive reached a problem thats got me got me thinking. What do you guys think.

Basically i had a 400w psu which worked fine but i wanted something a bit more powerful (just future proofing) so i got a 600w power supply unit. I installed it and switched the computer on, it posted but it doesnt boot, gets stuck on that black page with the blinking cursor. You guys are thinking 'ah it could be....' but heres the thing......it wont boot from the HDD or the CD-ROM. I have 2 dvd drives attached, so they arnt faulty, tried different bootable discs, then tried them in laptop-they work fine... ive resetted bios, cmos, the drives are all listed in bios as is the cpu & memory, ive reseated all components, etc. I have stripped the computer bare, minus only the necessary parts, no change. I thought i might have fried the motherboard or something while i was swapping the psu but that cant be the case as i will go on to explain.

I swapped the psu back from the 600w to the 400 w and it posted, and booted on the first go. It asked me if i wanted to boot from cd (which shows that the drive works) and when i ignored it, it booted into my OS.

The reason im stumped is because if the 600w was faulty then i dont understand why it posted and switches everything on but wont let the computer boot.....i really am keen to use the 600w instead of making do with the 400w because the 600w psu has allot more connectors and sata connections whereas with the 400w im using so many adapters for extra sata connections that i think its causing the sata drives to slowly fail (sometimes they dont respond, sometimes they make strange noises and they arnt just faulty full stop, i have experienced this with several new drives i have added over the last 18 months)

Any ideas that i havnt already tried will be most welcomed or any theories or advice....
Adnan786 Avatar
banned6y, 1m agoPosted 6 years, 1 month ago
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1 Like #1
check power connector you use (on 600w) for the hdd that has OP on and change to another 4 pin molex if ide/or early sata (do not use both power connectors on drive if it has both) or change sata power cable for another to the HDD that should boot operating system

Edited By: dontasciime on Oct 31, 2010 20:17: a
1 Like #2
That is very weird, I assume something must be faulty with 600w psu, If it's not the connections etc perhaps it's not giving them enough amps or too much?.

I'd consider sending back for a replacement.
banned#3
Hi guys thanks for such quick replies....doctas....im assuming you're talking ablout the 3 pin connector that goes into the back of the psu. I have 2 different sets and have tried both and the results are the same. The optical drives are both ide's, but what ive done is disconnected the slave. The hdd's are all sata 2's (one f1 and 2 f3's). Ive tried different configurations, as i dont mind re installing windows, ive left one hdd in the comp, then all, then different sata cables. Doesnt seem to make a difference. I even completely disconnected the ide optical drives in the hope that it will try and boot from the hdd and give me atleast a error message, but the cursor just keeps blinking. Then i disconnected the hdd and connected just the optical drive, hoping it will try to boot from it (i know i couldnt do much with it even if it booted, without a hdd attached, but atleast it would narrow allot of things down), but it just gets stuck on the cursor. None of this is an issue when i have the 400w psu attached.

Shaune im leaning towards thinking its the psu but i just dont have a reasoning as to why it would power up, post, i can get into bios etc, all the drives and components show up and have the correct attributes but it just wont boot, from ANY devices...it sure is a strange one to me. I cannot send it back unfortunately either as i got it a few months ago and it was just sitting there and i only decided now to swap it round.
#4
Hey, Perhaps you could connect the 600w psu to the motherboard and then connect the 400w psu to hard drives etc.. Then other way around see what the results are. Then you may have a better idea.
#5
shauneco
Hey, Perhaps you could connect the 600w psu to the motherboard and then connect the 400w psu to hard drives etc.. Then other way around see what the results are. Then you may have a better idea.


to do this you may need to jump one of the psus, just get a paper clip and connect green to black on the 24 pin connector to get it started up without a motherboard.

or something like this might help you determine if one of the pins is dodgy

http://www.dealextreme.com/details.dx/sku.27213
#6
have you a dedicated graphics card if so have you tried removing it and using on-board if you have it?
banned 1 Like #7
Hi guys, thank you for all the responses. I did think of using both psu's to see what happened.

Nightstud, i have a asus crosshair-no onboard graphics.

Anyhow i got it to work and am now using the computer to actually type this.

Im not entirely sure what the problem was to begin with, but after testing ok with the 400w, i put the 600 back in and started the computer with the bare essentials. When i got the post and it was ready to boot from the cd, i switched it off and added one component/connected one cable at a time and when i was convinced it was stable enough i wrapped it all up.

But i want to thank all of you guys, if it wernt for you lot i would have probably given up all together and would have just made do with the 400w psu. If repping was possible i would rep you all. And ive learnt how to jump a psu (mind you, wouldnt there be a danger of electricution by using a paperclip?).
1 Like #8
Adnan786
Hi guys, thank you for all the responses. I did think of using both psu's to see what happened. Nightstud, i have a asus crosshair-no onboard graphics. Anyhow i got it to work and am now using the computer to actually type this.Im not entirely sure what the problem was to begin with, but after testing ok with the 400w, i put the 600 back in and started the computer with the bare essentials. When i got the post and it was ready to boot from the cd, i switched it off and added one component/connected one cable at a time and when i was convinced it was stable enough i wrapped it all up.But i want to thank all of you guys, if it wernt for you lot i would have probably given up all together and would have just made do with the 400w psu. If repping was possible i would rep you all. And ive learnt how to jump a psu (mind you, wouldnt there be a danger of electricution by using a paperclip?).
probably with the paperclip but you can like instead of rep

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