deadlinks: effects in SEO

hi everyone,
i just wanna ask what would be the effects of deadlinks in SEO.
the site that i've been optimizing have been down for about a week. maybe there's a problem with the hosting. our SERP position is going down and i dont know when will the site be activated. i dont have any idea of what's going on because my client have been offline since the site gone down.
is there a possibility that the site could be banned in SEs? or is it more likely to happen that when the site is up, im gonna start SEOing it all over again?

dude.

I donno why its so
but i tend to agree with you.. somewhat./.

I had my site down for a few days.. cuz my web hosting company pulled out on me.
and my site rankings plunged down. from top few positions to rock bottom.

Before the update of course..

Make sure that your side don't go down or you will loose your rank.....

Dead links will definetly effect the "traffics" as well as "page quality". That's why you should check the backlinks in order to remove the dead links from your link page.

It is a good idea to remove dead links from your web pages