I don't think it should be an issue. Google will note the IP address of where your backlink is coming from, and if they were all on the same subnet, then it would send a red flag to them (known as a link farm), but since I assume you are mixing this up and posting on a variety of sites, you should be fine.
The IP address of the laptop you use shouldn't have anything to do with it.

It is not a issue using one laptop.It is giving problem when you use same ip.Use different proxies to solve the problem.

no problem.......backlinks from the samp ip will be consider one backlink so try to collect backlinks from the different ips...

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It doesn't matter at all really. Totally ok to build links just using a single laptop.

This should help.
Article
By Matthew D.C
Are you tired of building site only to have very few visitors, if any at all? Traffic generation and search engine optimization (SEO) are the single most difficult aspect of internet marketing for the newly inducted. The Guru's don't like to give out their REAL secrets and I can understand why, but the truth is, there are really basic methods of traffic generation and SEO that can work for anyone. Best of all? They are even easy for internet marketing newbies to understand!
The first main method of traffic generation is article marketing. Sites like the one you are reading right now will allow you to post articles and leave your link in the author section at the bottom of your article. They do this because they are getting tons of valuable content for free and helping build authority for their site, while helping you with exposure and link building. Article marketing is one of the main methods you should be using when starting out in online marketing. It's cheap (free!) and very easy to understand. As long as you can write coherent content that someone will want to read, you can get started immediately.
The next method of traffic generation is social media. This area gets varying explanations but I consider twitter, Facebook, social bookmarking, and any social community type site as social media marketing. This method is also rather simple and also FREE! All you need to do is create accounts on the various bookmarking sites and community sites and add your links to all of your accounts. Post small articles on Twitter and Facebook including your link and you will be well on your way to getting increased traffic to your site.
Another method that many people often overlook is Yahoo Answers. Yahoo answers will not necessarily help you build up your Google Pagerank, and it won't count as valid backlinks, but many people don't realize just how many clickthroughs you can get from yahoo answers. One simple link at the bottom of a good answer, especially one that is chosen as the best answer, can get you continuing long term traffic from people who like your answer and are willing to find out more of what you have to say. Yahoo answers is a site that every marketer should be using, but surprisingly few really do.
Forum and Blog commenting can also be very useful. Simply find some of the most popular blogs and forums for whatever your topic is and make an account, being sure to use your link to your site as part of your signature. This method can help with backlinking and pagerank if the site isn't using "nofollow" tags, and if the blog or forum is popular enough, it can also drive significant traffic to your site. This is probably the most time consuming method of traffic generation, but also one of the most useful and underated. If you hire someone to do SEO for you, this is one of the most commonly used methods.
The last method and one that can be somewhat difficult for true marketing newbies is YouTube. YouTube will allow you to post a link in the info box to the right of your video. This can bring in some serious traffic through clickthroughs. A lot of people will click the link next to a video if the content is useful and informative. The problem is that most people believe making videos is time consuming and difficult. Boy are they wrong! Using a laptop with a webcam and YouTube built in recorder, you can make a blog style recording in 3 to 5 minutes that can get you 100s if not 1000s of visitors to your site. Don't overlook YouTube.
Getting traffic to your site can seem like a daunting task, but it isn't as hard as you think. Just remember that the hard work you put in now, building backlinks and clickthroughs, will help you make a nice residual income down the road. Once the links are out there, they will stay there forever, consistently helping you to make more sales. Don't get discouraged if it takes time. Just keep building links and I promise you will start making sales!

I dont think whether there is any problem to use one laptop