What replacement power supply to get?

>Ok, so if you have a stock computer and have not upgraded ANY parts, including video, I would say a standard 400 Watt psu will work fine (you have a 350). Rosewill makes good standard psu's that are relatively inexpensive but do not go out on you after 3 months (that is what the cheapo chinese type do). $29.99

http://www.newegg.com/Product/Product.aspx?Item=N8...

I own a 2 Dell 8400's. One I turned into a media center computer and the other is for spare parts. I have some experience with older Dell towers. One thing I have discovered is that they are very proprietary. Notice the cut outs on the back of the tower and how the openings are just big enough for the fan and power plug. Now open it up. See that green clip behind the PSU. The depth of it has to be just right for it to clear that. Frankly the OEM might be worth the extra money so as to not have any problems. Also old Dell towers are a dime a dozen on craigslist. I have seen an 8400 that is kinda fried for $40. It has been there for awhile. Might call and offer $20. But beware that most older Dells do not have PSU's as big as the 8400. Believe it or not 350 watts is big for an older Dell. Most others have 250 or 300 watt ones. One of the reasons I chose this model to make a cheap media center computer. My other suggestion would be to pull it and go to a local computer store. Look a different PSU's and compare them to the Dell. If you find one you think will work and are OK with the price great. If not see if you can buy it online cheaper. Buying one online is kinda doing it blind. You really will not know if it will work until you try it. I am not even sure if an aftermarket one can be used at all. Even then you might have to take some tin snips to the back of the case. Hope some of this helps. Good Luck.

Dell Dimension 8400 Power Supply

This is what I found at Newegg.

Antec VP-450w

Corsair CX430w VE

Both of these models have 20+4 pin main connector and 4+4 12v CPU power connector. You need the 20 pin and a 4 pin. Both under $45, the Corsair has a rebate also.

Used the Corsair 400w, a older model that was replaced by this one on a system similar to yours a few years ago. Still runs fine. Either one of these will run a newer smaller system, if you decide to upgrade. Hope it helps.

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I bought a Egreat EG-M31B off eBay - it arrived and I plugged the power supply in at it made a popping sound and the light won't come on. So, I guess the power supply unit is blown. does anyone know if i can get a replacement in the UK or Europe, or whether I could just use a variable voltage plug from maplin or something?

Any new power suplly will do, I'd reccommend getting a cooler master 400W (or up) PSU, your system is pretty basic and most power supplies will do.

Dell Dimension 8400 Specs

Your pre-built computer can take any standard ATX power supply. That being said, stick to a quality, reputable brand. Not some cheap garbage like the one that came with your pre-built. Consider: http://www.newegg.com/Product/Product.aspx?Item=N8...

your mother board is because it cannot handle the bigger power wattage.You need to go back to the old power supply.

Don't think that this is right