NEW YORK (

TheStreet

) -- A busy week for the tech sector kicked off with the news that

Apple

(AAPL) - Get Report

CEO Steve Jobs is taking a

medical leave of absence

from the consumer technology giant.

A statement released by Jobs on Monday confirmed that COO Tim Cook would again step in to handle the day-to-day running of the iPhone maker. "I will continue as CEO and be involved in major strategic decisions for the company," said Jobs.

Apple COO Tim Cook

The iconic CEO's departure raised questions for investors about

Apple's future

, although Wall Street seems to have faith in

Cook's ability

to guide the tech heavyweight.

The news came a day before Apple posted stellar

fiscal first-quarter results

, boosted by strong sales of its Mac, iPhone and iPad products.

Shares of Apple closed down $5.96, or 1.79%, at $326.72 on Friday amid a broader selloff in tech stocks.

IBM & Google Results

Bellwethers

IBM

(IBM) - Get Report

and

Google

(GOOG) - Get Report

also reported their respective

fourth-quarter results

.

IBM was up first,

confortably beating analysts' estimates

on Tuesday. The company's gross profit margin also came in at 49%, up 0.8 points year-over-year, and IBM said that its business analytics revenue was up 19% year-over-year.

Search giant Google posted its results after market close on Thursday,

also beating consensus estimates

, although the company's solid gains in search was overshadowed by news that co-founder

Larry Page will replace Eric Schmidt as CEO

.

The executive change, which takes place on April 4, has been under discussion for a while, said Schmidt. "As Google has grown, managing the business has become more complicated," he explained in a Google blog post Thursday. "So Larry, Sergey and I have been talking for a long time about how best to simplify our management structure and speed up decision making -- and over the holidays we decided now was the right moment to make some changes to the way we are structured."

Schmidt, who is one of Silicon Valley's best-known corporate leaders, will eventually assume the role of Executive Chairman, serving as an advisor to Page and co-founder Brin.

Google shares closed down $14.94, or 2.38%, at $611.83 on Friday. IBM's stock was down 30 cents, or 0.19%, at $155.50 on Friday.

F5 Networks' Miss

Networking company

F5 Networks

(FFIV) - Get Report

came in just shy of Wall Street's

first-quarter revenue expectations

on Wednesday, and the miss

hammered the company's stock

.

Shares of F5 crept up 82 cents, or 0.75%, to close at $109.97 on Friday.

AMD Gets Fourth-Quarter Beat

Chipmaker

AMD

(AMD) - Get Report

, which is playing catch-up to semiconductor rival

Intel

(INTC) - Get Report

, also beat consensus estimates in its

fourth-quarter results

, released after market close on Thursday.

AMD's revenue, however, was flat compared with the same period last year. Shares of AMD closed up 48 cents, or 5.99%, at $7.54 on Friday.

HP's Boardroom Reshuffle

HP announced a sweeping boardroom reshuffle after market close on Thursday, signaling new CEO Leo Apotheker's desire to

shift the company's strategy

.

Former

eBay

(EBAY) - Get Report

and

Alcatel-Lucent

(ALU)

CEOs Meg Whitman and Patricia Russo are among five new members of the HP board, along with Shumeet Banerji, CEO of

Booz & Co.

, Gary Reiner, former CIO of

General Electric

(GE) - Get Report

and

AXA Private Equity

CEO Dominique Senequier.

HP also announced that four incumbent directors are not standing for re-election at the company's annual meeting of stockholders.

Shares of HP ended the week up 45 cents, or 0.96%, at $47.23.

Facebook Now Worth $50 Billion

Away from the earnings calendar,

Facebook

announced Friday

it has raised $1.5 billion

, valuing the social networking giant at $50 billion.

The investment was broken into two parts.

Goldman Sachs

(GS) - Get Report

clients outside the U.S. participated in a $1 billion fund that was completed on Friday, and Goldman and Russian firm

Digital Sky Technologies

separately invested another $500 million in December.

Facebook said in a press release it has no plans to use the funds immediately, but that it will use them eventually for continued expansion.

Tech's Week Ahead

Tech's earnings season gathers pace next week with quarterly results from a slew of companies, including

Juniper

(JNPR) - Get Report

,

EMC

(EMC)

,

Verizon

(VZ) - Get Report

,

Symantec

(SYMC) - Get Report

,

AT&T

(T) - Get Report

,

Nokia

(NOK) - Get Report

,

Riverbed

(RVBD)

and newly independent

Motorola Solutions

(MSI) - Get Report

.

Tech watchers will likely keep their eyes peeled Thursday for

Microsoft

(MSFT) - Get Report

, which posts its second-quarter results after market close.

--Written by James Rogers in New York.

>To follow the writer on Twitter, go to

http://twitter.com/jamesjrogers

.

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