New Case computer blackout

I have a case that is several years old so i bought a new one.
When I transfer the components and start it up i get 1 long loud beep and nothing coming up on my computer monitor. (sometimes a get more than 1 long loud beep).

Obviously i thought perhaps the power supply is bad BUT all the fans are spinning, lights working...
My computer even makes its normally loading sounds complete with windows start up noise etc at the appropriate time.

I have no idea what the problem could be. When i transfer my components back to my old case it works fine EXCEPT the odd time i get a bug while starting something like
Please re-setting CPU Frequency in the CMOS setup

HARDWARE ETC:
Operating System: Windows HE with the latest service packs
Motherboard: Nforce4 A939
Processor: CPU AMD 3200+
Video Card: Geforce 6600 GT
RAM: 2 gigs
CASE: old one is 230W, new one is 420W

Any ideas?

 

Welcome to MajorGeeks!

What do you mean by this? 'CASE: old one is 230W, new one is 420W'?

Are you using 2 PSU's in 2 cases? Or one PSU, 2 cases?

Also, a fairly commone problem could be the MOBO standoffs. Those are the little studs that you screw the motherboard onto the case. Make sure there are none installed that you are not putting a screw into.

E

 

Yup. An extra stand off can cause all sorts of problems. Also make sure you're connecting the front panel wires to the correct header. If you put an LED wire on the reset header you'd have all sort of problems. And, yes, a flakey PSU can wreck havoc all over the place.

 

My old case has a 230 watt power supply
My new case has a 420 watt power supply

I am quite sure the front panel wires are all correct and i do put all the screws in properly.

I will have another retry now though just incase.

I have done this about 20 times now so its fairly fast to do now.

Could those problems cause my computer to still run fine in every way other than to show nothing on the screen, and of course the long beep?

Could it have anything to do with changing to a different power supply?

 

lol it worked this time. Your advise is lucky and accurate!
Hopefully my fiance wont be afraid of buying me more computer gear in the future

For reference these are the things i made sure i did this time / changes i made.

1) I made sure all the MOBO standoffs were in the correct holes including no screws in the gaps in my MOBO where there is no corresponding case screw.

2) I bent my video card metal strip thing so that i can get it better into the slot (which means i cant screw it in as it is now).
I dont know whether it is possible to have the video card partially in so that you get power/fan only?

3) I havent installed my case fan.

Thanks a lot guys

 

Glad you got it fixed! I vote for #2. I have found a lot of times I have to cut off part of the metal bracket on PCI cards and such so they properly fit in the slots.

And thanks for posting back your results. Now get that case fan running!

E

 

:highfive :celebrate :dancer :drink
:cool Happy to hear you got it working! Nice job! :major